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.
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.