Types of Angles

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10 Terms

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Acute angle

Measures greater than 0∘and less than 90

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Right angle

Measures exactly 90. It is often shown with a small square symbol in the corner

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Obtuse angle

Measures greater than 90∘ and less than 180

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Straight angle

Measures exactly 180, forming a straight line

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Reflex angle

Measures greater than 180∘ and less than 360

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Adjacent angles

Angles that share a common vertex and a common side

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Vertically opposite angles

Pairs of opposite angles formed by two intersecting lines. They are always equal in measure.

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Complementary angles

Two angles that add up to 90

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Supplementary angles

Two angles that add up to 180

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Full angle (or revolution)

Measures a full turn, which is exactly 360.