Help with angles plz! What is angle B?
c = a + b
a = 2b - 15
a + b + c = 180
So, 2a + 2b = 180
Plugging in 2(2b - 15) for 2a, we get:
4b - 30 + 2b = 180
6b - 30 = 180
6b = 210
b = 35
a = 2(35) - 15
a = 70 - 15
a = 55
55 + 35 = c
c = 90
a = 55, b = 35, c = 90
Answer: 35
