Find one positive angle and one negative angle that are soterminal with the given angle

For **9π/2** into degrees I got **13π/2** for the positive and **5π/2** for the negative.

Comparing these answers to other peoples mine seems to not be correct.

What am I doing wrong? Plz explain.

BLANK
Nov 29, 2018

#1**+1 **

Your answers seem correct, but maybe the question wants a negative angle? (ex. -3π/2 )

Also, this is one of those questions where there are infinite possible answers, so maybe other people just wrote down something different.

HuskyLove
Nov 29, 2018

#2**+1 **

To find a positive co-terminal angle...add 2pi to 9pi/ 2

So we have 2pi + 9pi/2 = 4pi/2 + 9pi/2 = 13pi/2

To find a negative co-terminal angle....subtract 6pi from 9/pi/2

So we have

9pi/2 - 6pi = 9pi/2 - 12pi/2 = -3pi/2

You are correct HL.....infinite answers are possible...!!!!

CPhill
Nov 29, 2018