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Questions and Answers
What is an acute angle?
What is an acute angle?
- An angle whose measure is less than 90 degrees. (correct)
- An angle whose measure is exactly 90 degrees.
- An angle whose measure is exactly 180 degrees.
- An angle whose measure is greater than 90 degrees and less than 180 degrees.
What is an obtuse angle?
What is an obtuse angle?
- An angle whose measure is exactly 180 degrees.
- An angle whose measure is greater than 90 degrees and less than 180 degrees. (correct)
- An angle whose measure is exactly 90 degrees.
- An angle whose measure is less than 90 degrees.
What is a straight angle?
What is a straight angle?
- An angle whose measure is exactly 180 degrees. (correct)
- An angle whose measure is less than 90 degrees.
- An angle whose measure is exactly 360 degrees.
- An angle whose measure is greater than 90 degrees and less than 180 degrees.
What is a protractor used for?
What is a protractor used for?
What does the term 'slide' refer to in geometry?
What does the term 'slide' refer to in geometry?
What does 'flip' mean in geometric transformations?
What does 'flip' mean in geometric transformations?
What is a turn in terms of geometry?
What is a turn in terms of geometry?
What does it mean for shapes to be similar?
What does it mean for shapes to be similar?
What does it mean for shapes to be congruent?
What does it mean for shapes to be congruent?
What is an equilateral triangle?
What is an equilateral triangle?
What is a scalene triangle?
What is a scalene triangle?
What is an isosceles triangle?
What is an isosceles triangle?
What is a right triangle?
What is a right triangle?
What is an obtuse triangle?
What is an obtuse triangle?
What is an acute triangle?
What is an acute triangle?
What is the circumference of a circle?
What is the circumference of a circle?
What is a chord in a circle?
What is a chord in a circle?
What is a diameter?
What is a diameter?
What is a radius?
What is a radius?
What is the origin in a coordinate plane?
What is the origin in a coordinate plane?
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Study Notes
Angles in Geometry
- Acute Angle: Measures less than 90 degrees.
- Obtuse Angle: Measures greater than 90 degrees but less than 180 degrees.
- Straight Angle: Measures exactly 180 degrees.
Tools for Measuring Angles
- Protractor: Essential tool for measuring or creating angles with precision.
Transformations in Geometry
- Slide (Translation): Moving a shape smoothly across a surface without rotation or flipping.
- Flip (Reflection): Turning a shape over to face the opposite direction.
- Turn (Rotation): Rotating a shape around a fixed point on a plane.
Classification of Shapes
- Similar Shapes: Identical shape with proportional size differences.
- Congruent Shapes: Exact same shape and size without any alteration.
Types of Triangles by Side Length
- Equilateral Triangle: All three sides are of equal length.
- Scalene Triangle: All three sides have different lengths.
- Isosceles Triangle: Two sides are equal in length; may also be equilateral if all sides are equal.
Types of Triangles by Angle
- Right Triangle: Contains one right angle (90 degrees).
- Obtuse Triangle: Contains one obtuse angle (greater than 90 degrees).
- Acute Triangle: All three angles are acute (less than 90 degrees).
Circle Measurements
- Circumference: Total distance around the circle's boundary.
- Chord: Line segment connecting two points on a circle's circumference.
- Diameter: Line segment passing through the center from one edge of the circle to the other.
- Radius: Distance from the center of the circle to any point on the circumference.
Coordinate Geometry
- Origin: The intersection point of the x and y axes on the coordinate plane, represented as (0,0).
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