π/2

Definition

Pi divided by two (π/2) is an angle measurement equal to 90 degrees or one-fourth of a complete revolution in a unit circle.

Think about eating pizza slices with your friends. If there are four people and only one pizza, everyone gets an equal slice measuring π/2 radians.

Radian: A unit for measuring angles based on the radius of a circle. One full revolution equals 2π radians.

Unit Circle: A circle with radius 1 centered at (0,0) used for understanding trigonometric functions.

Angle Measurement: A way to quantify how much something is turning or rotating. It can be measured in degrees or radians.

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AP® and SAT® are trademarks registered by the College Board, which is not affiliated with, and does not endorse this website.