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Angles can be classified by size:
- Acute angle: between 0° and 90°
- Right angle: equal to 90°
- Obtuse angle: between 90° and 180°
- Straight angle (line): equal to 180°
- Reflex angle: between 180° and 360°
In a shape, an angle can be an interior angle or an exterior angle.
Angles that sum to 90° are called complementary angles.
Angles that sum to 180° are called supplementary angles.
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Continue Learning about Geometry
Why is it useful to have more than one way of naming an angle?
dont know either!
What are the five ways to prove a triangles congruent?
The 5 ways to prove that two triangles are congruent are to find equal: 1) side-side-side 2) side-angle-side 3) angle-side-angle 4) angle-angle-angle 5) hypotenuse-leg
How many ways to name an angle?
There are three ways to name an angle, provided there are only three points on the angle. Say the vertex is point A, and there are two rays extending. Each has another point on it, points B and C. You can name this angle BAC, CAB, or A.
What are three ways you can classify an angle by sides?
by how long it is
What are the two ways to name an angle?
by vertex or point
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