Answer:
The whole triangle is 180° , and means + in math
15-x + 2x= 180
-x+2x=180-15
-x+2x=165
2x=165
2x/2=165+/2
=82.5
904.8
Step-by-step explanation:
equation V=4/3πr3
The answer is:
55 km (a)