π/2 radians
90°
π/2 radians is an angle measurement that is equivalent to 90 degrees. In trigonometry, an angle of 90 degrees or π/2 radians is commonly referred to as a right angle.
To visualize π/2 radians or 90 degrees, think of a clock face. The angle between the hour hand and the minute hand is 90 degrees or π/2 radians when the clock reads 3:00.
In terms of the unit circle, an angle of π/2 radians or 90 degrees has a terminal side that lies on the positive y-axis. The point where the terminal side intersects the unit circle has coordinates (0,1).
It’s worth noting that radians and degrees are two different units for measuring angles. Radians are the preferred unit for measuring angles in calculus and higher level math courses because they simplify many formulas; whereas degrees are generally used in everyday life and basic math classes.
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