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An angle consists of two rays with a common endpoint. The two rays is called the side of the angle and the common endpoint is the vertex of the angle. Each angle has a measurement generated by the rotation about the vertex. The measure is determined by the rotation of the terminal side about the initial side. Angles can be classified based upon the measure.
Types of angles are usually based on angle measurement
An Acute Angle is an angle which measures less than 90°.
A Right Angle measures exactly 90°
An Obtuse Angle measures greater than 90° but less than 180°
A Straight Angle measures exactly 180°
A Reflex Angle measure is greater than 180° but less than 360°
Perimeter and Area