how do you find the function csc 225 degrees without using a calculator?

Question

drwls · Answer

It will have the same sign as 1/csc225 = sin 225, which is negative in the third quadrant.
The absolute value is the same as that of reference angle to the 180 degree, -x axis, which is 45 degrees.

csc 45 = 1/sin 45 = sqrt 2

The value of csc 225 is therefore
-sqrt2 = -1.414

anonymous · Answer

thank you drwls!