Understanding Elementary Shapes

- One complete turn of the hand of a clock is one revolution. The angle of one revolution is called a
**complete angle.**

- A right angle is of a revolution and a straight angle is of a revolution.

- 1 complete angle = 2 straight angles = 4 right angles
- 1 straight angle = 2 right angles
- If an angle measures less than a right angle then it is known as an
**acute angle.**

The following angles are acute:

- If an angle measures more than a right angle but less than a straight angle, then it is an
**obtuse angle.**

The following angles are obtuse: …

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