Very rusty on how to do this, any help would be appreciated.
angle A= 90
angle B= 20
angle C= 70
Side BC = 9
How can I calculate Side AB's length with the information given?
Thanks in advance!
This is a right angled triangle, so you can use the trig ratios to solve this problem. Draw the triangle out.
Knowing that side BC is opposite from angle A (90 degree angle), that would be the hypothenuse and the longest side...
Using the 70 degree angle at C, you can use the sine ratio:
Theta would be your angle of 70 degrees. Opposite of this angle is side AB, and the hupothenuse is 9