12^2+x^2=15^2
144+x^2=225
- 144 -144
=81= 9
X=9
Answer:sufwubfwjbfuiqwnuednfubqw cjbew
Step-by-step explanation: wejfuncuwebfucwbrpubfwuefb38248237r8
Supplementary angles add up to 180 degrees.
so if one angle is 60 degrees, then the other angle is (180 - 60) = 120