Angles can be divided into five different groupings, based on their degree measurements.

The main categories of angles are: (1) right; (2) acute; (3) obtuse; (4) straight; and (5) reflex.

Reminder: Angles are always measured in degrees.

ANGLE TYPE & DEGREE MEASUREMENT

Right        90°

Acute Less than 90°

Obtuse More than 90° but less than 180°

Straight 180°

Reflex Between 180° and 360°


Complementary angles:

These two angles are complementary. They can be "pasted" together to form a right (90 degree) angle.

Supplementary angles:

These two angles are supplementary. They can be "pasted" together to form a straight line (180 degree angle).

Mini-Lesson Workout Answers
Angle Types Based on Degree Measurement


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1. The sum of the degrees of three right angles is  270° .
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2. Angles that measure more than 90° and less than 180° are known as  obtuse  angles.
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3. A right angle measures  90  degrees.
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4. Angles that measure 90° are  right  angles.
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5. "B" in angle ABC refers to  the vertex .
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