Facts about Acute Angles

• One acute angle will always measure between 0° and 90° .

• Two acute angles can sum to be either greater than, less than, or equal to a right angle.

• Two acute angles can be complementary angles (adding to 90° ).

• Two acute angles alone cannot sum to make a straight angle (180° ).

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Obtuse Angles

An obtuse angle is an angle of greater than 90° and less than 180°. It is bigger than an acute angle. It is smaller than a straight angle, which measures 180°. ​

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Reflex angles are angles measuring greater than 180 degrees and less than 360 degrees. The measure of a reflex angle is added to an acute or obtuse angle to make a full 360 degree circle.

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​Reflex Angles

When two straight lines intersect each other at 90˚ or are perpendicular to each other at the intersection, they form the right angle. A right angle is represented by the symbol ∟.

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​Credit to: What is Right Angle? - [Definition, Facts & Example]

Right Angles

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