Geometry Terms Flashcards
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Geometry Terms Flashcards

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Questions and Answers

What is a point?

  • A flat surface
  • A specific place marked by a dot (correct)
  • A straight path
  • An angle

    • Which of the following describes a line?

  • A flat surface
  • An angle
  • A part of a line with two endpoints
  • A straight path that goes on forever in both directions (correct)

    • What is a line segment?

  • A straight path going in one direction
  • A part of a line with two endpoints (correct)
  • A type of angle
  • A line without endpoints

    • What defines a ray?

    <p>A straight path that has an endpoint on one side and goes indefinitely on the other</p> Signup and view all the answers

    What is a plane?

    <p>A flat surface that extends in all directions</p> Signup and view all the answers

    What are intersecting lines?

    <p>Lines that cross each other.</p> Signup and view all the answers

    What are parallel lines?

    <p>Lines that lie next to each other without ever getting close or further apart.</p> Signup and view all the answers

    What are perpendicular lines?

    <p>Lines that intersect to form right angles.</p> Signup and view all the answers

    What are degrees in terms of angles?

    <p>Units used to measure an angle.</p> Signup and view all the answers

    What is a right angle?

    <p>An angle that measures 90 degrees.</p> Signup and view all the answers

    What is an acute angle?

    <p>An angle that measures less than 90 degrees.</p> Signup and view all the answers

    What is an obtuse angle?

    <p>An angle that is more than 90 degrees.</p> Signup and view all the answers

    What is a straight angle?

    <p>An angle that measures 180 degrees.</p> Signup and view all the answers

    What is a vertex?

    <p>The point where two rays or line segments meet to form an angle.</p> Signup and view all the answers

    What is an equilateral triangle?

    <p>A triangle with all three sides the same length.</p> Signup and view all the answers

    What is an isosceles triangle?

    <p>A triangle with two sides that have the same length.</p> Signup and view all the answers

    What is a scalene triangle?

    <p>A triangle with no equal length sides.</p> Signup and view all the answers

    What is a right triangle?

    <p>A triangle that has a 90-degree angle.</p> Signup and view all the answers

    What is an acute triangle?

    <p>A triangle that has three interior angles that are each less than 90 degrees.</p> Signup and view all the answers

    What is an obtuse triangle?

    <p>A triangle that has one interior angle greater than 90 degrees.</p> Signup and view all the answers

    What is an interior angle?

    <p>An angle found inside a shape or object.</p> Signup and view all the answers

    What is an exterior angle?

    <p>An angle found outside of a shape or object.</p> Signup and view all the answers

    What does it mean for shapes to be congruent?

    <p>Two shapes with all sides and angles exactly the same.</p> Signup and view all the answers

    What does it mean for shapes to be similar?

    <p>Shapes that have the same angles but different sizes.</p> Signup and view all the answers

    What is a quadrilateral?

    <p>Any polygon that has four sides.</p> Signup and view all the answers

    What is a polygon?

    <p>Any object made of at least three straight lines.</p> Signup and view all the answers

    What defines a rectangle?

    <p>A shape with four right angles and opposite sides that are parallel and congruent.</p> Signup and view all the answers

    What defines a square?

    <p>A shape with all sides congruent and four right angles.</p> Signup and view all the answers

    What is a parallelogram?

    <p>A four-sided shape with opposite sides congruent and parallel.</p> Signup and view all the answers

    What defines a rhombus?

    <p>A four-sided shape where all sides are congruent and opposite sides are parallel.</p> Signup and view all the answers

    What is a trapezoid?

    <p>A four-sided shape with only one set of parallel lines.</p> Signup and view all the answers

    What is a regular polygon?

    <p>A shape with congruent sides and identical angles.</p> Signup and view all the answers

    What is an irregular polygon?

    <p>A shape with sides of different lengths and angles.</p> Signup and view all the answers

    What is a pentagon?

    <p>A five-sided shape.</p> Signup and view all the answers

    What is a hexagon?

    <p>A six-sided shape.</p> Signup and view all the answers

    What is a heptagon?

    <p>A seven-sided shape.</p> Signup and view all the answers

    What is an octagon?

    <p>An eight-sided shape.</p> Signup and view all the answers

    What is a nonagon?

    <p>A nine-sided shape.</p> Signup and view all the answers

    What is a decagon?

    <p>A ten-sided shape.</p> Signup and view all the answers

    What is an undecagon?

    <p>An eleven-sided shape.</p> Signup and view all the answers

    What is a dodecagon?

    <p>A twelve-sided shape.</p> Signup and view all the answers

    What is a diagonal?

    <p>A line segment that joins two vertices of a shape.</p> Signup and view all the answers

    What is the center of a circle?

    <p>A point in the middle of a circle that is equidistant from the circle's edge.</p> Signup and view all the answers

    What is a radius?

    <p>A line segment connecting the center of a circle to a point on the circle.</p> Signup and view all the answers

    What is a diameter?

    <p>A line segment that passes through the center and connects two points on the circle.</p> Signup and view all the answers

    What is a chord?

    <p>A line segment that connects two points on a circle without necessarily passing through the center.</p> Signup and view all the answers

    What is a central angle?

    <p>An angle whose vertex is at the center of a circle.</p> Signup and view all the answers

    What is line symmetry?

    <p>When an object has a line drawn through the center and both sides are congruent.</p> Signup and view all the answers

    What is rotational symmetry?

    <p>When an object can be rotated less than 360 degrees and looks the same.</p> Signup and view all the answers

    What is circumference?

    <p>The distance around the outside of a circle.</p> Signup and view all the answers

    What is a complementary angle?

    <p>Two angles that add up to 90 degrees.</p> Signup and view all the answers

    What is a supplementary angle?

    <p>Two angles whose measures have a sum of 180 degrees.</p> Signup and view all the answers

    Study Notes

    Geometry Terms

    • Point: A specific location represented by a dot and typically labeled with a letter.
    • Line: An infinite straight path extending in both directions, named using two points on the line.
    • Line Segment: A part of a line defined by two endpoints, named after these endpoints.
    • Ray: A line segment with one endpoint that extends infinitely in one direction, named starting with the endpoint.
    • Plane: An infinite flat surface named by three distinct points within it.
    • Intersecting Lines: Lines that cross each other at one or more points.
    • Parallel Lines: Lines that remain equidistant and never meet or diverge.
    • Perpendicular Lines: Lines that intersect to form right angles (90 degrees).

    Angles

    • Degrees: Units used for angle measurement.
    • Right Angle: An angle measuring exactly 90 degrees.
    • Acute Angle: An angle that measures less than 90 degrees; considered 'small'.
    • Obtuse Angle: An angle that exceeds 90 degrees; characterized as 'large'.
    • Straight Angle: An angle measuring 180 degrees, appearing as a straight line.
    • Interior Angle: An angle located inside a shape.
    • Exterior Angle: An angle located outside a shape.
    • Complementary Angles: Two angles that sum to 90 degrees.
    • Supplementary Angles: Two angles that sum to 180 degrees.

    Triangles

    • Equilateral Triangle: A triangle with all sides of equal length.
    • Isosceles Triangle: A triangle with two sides of equal length.
    • Scalene Triangle: A triangle with no sides of equal length.
    • Right Triangle: A triangle that includes a 90-degree angle.
    • Acute Triangle: A triangle with three angles each measuring less than 90 degrees.
    • Obtuse Triangle: A triangle containing one angle greater than 90 degrees.

    Polygon Basics

    • Polygon: A shape with at least three straight sides, with no gaps or curves.
    • Quadrilateral: A polygon with four sides.
    • Regular Polygon: A polygon with all sides and angles congruent.
    • Irregular Polygon: A polygon made up of sides of different lengths and angles.
    • Specific Polygon Names:
      • Pentagon: Five sides.
      • Hexagon: Six sides.
      • Heptagon: Seven sides.
      • Octagon: Eight sides.
      • Nonagon: Nine sides.
      • Decagon: Ten sides.
      • Undecagon: Eleven sides.
      • Dodecagon: Twelve sides.

    Circles

    • Center of a Circle: The point equidistant from all points on the circumference.
    • Radius: A line segment from the center to any point on the circle.
    • Diameter: A line segment passing through the center, connecting two points on the circle.
    • Chord: A line segment connecting two points on the circle, not necessarily passing through the center.
    • Central Angle: An angle whose vertex is positioned at the center of the circle.
    • Circumference: The total distance around a circle.

    Symmetry

    • Line Symmetry: Occurs when a shape can be divided along a line such that both halves are congruent.
    • Rotational Symmetry: When a shape can be rotated less than 360 degrees and appear unchanged.

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    Test your understanding of basic geometry terms with these flashcards. Each card features a key concept such as a point, line, or line segment, along with its definition. Ideal for students looking to reinforce their geometry vocabulary.

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