Angles in Standard Position and Coterminal Angles

• Initial side

• Terminal side

• Standard Position

• Coterminal

• Radian

• Sector

• Central Angle

The measure of an angle is positive when the rotation of its terminal side is counterclockwise and negative when the rotation is clockwise. The terminal side of an angle can rotate more than 360°.

​Draw 240°

​Draw -50°

​Draw 500°

On slide 6, angles 500° and 140° are coterminal because their terminal sides coincide. An angle coterminal with a given angle can be found by adding or subtracting multiples of 360°.

​There are many such angles, depending on what multiple of 360° is added or subtracted.