Questions and Answers
What is a point?
Which of the following describes a line?
What is a line segment?
What defines a ray?
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What is a plane?
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What are intersecting lines?
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What are parallel lines?
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What are perpendicular lines?
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What are degrees in terms of angles?
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What is a right angle?
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What is an acute angle?
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What is an obtuse angle?
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What is a straight angle?
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What is a vertex?
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What is an equilateral triangle?
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What is an isosceles triangle?
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What is a scalene triangle?
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What is a right triangle?
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What is an acute triangle?
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What is an obtuse triangle?
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What is an interior angle?
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What is an exterior angle?
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What does it mean for shapes to be congruent?
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What does it mean for shapes to be similar?
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What is a quadrilateral?
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What is a polygon?
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What defines a rectangle?
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What defines a square?
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What is a parallelogram?
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What defines a rhombus?
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What is a trapezoid?
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What is a regular polygon?
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What is an irregular polygon?
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What is a pentagon?
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What is a hexagon?
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What is a heptagon?
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What is an octagon?
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What is a nonagon?
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What is a decagon?
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What is an undecagon?
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What is a dodecagon?
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What is a diagonal?
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What is the center of a circle?
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What is a radius?
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What is a diameter?
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What is a chord?
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What is a central angle?
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What is line symmetry?
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What is rotational symmetry?
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What is circumference?
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What is a complementary angle?
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What is a supplementary angle?
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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.
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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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Description
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.