Question

trig: can someone explain to me how pi/2 is the coterminal of 5pi/2??

Answer 1

to find the coterminal angle of a given angle, you add or subtract 2pi (2pi radians = 360 degrees)

let's add 2pi to pi/2

pi/2 + 2pi

pi/2 + 4pi/2

(pi + 4pi)/2

5pi/2

so the two angles pi/2 and 5pi/2 are coterminal. This means they point in the same exact direction: directly north

Answer 2

thats right! i had forgotten.. thank u....

Answer 3

you're welcome