Answer:
Below in bold.
Step-by-step explanation:
The 3 angles of a triangle sum to 180 degrees, so:
if one angle is x degrres the other id 2x, and:
x + 2x + 60 = 180
3x = 180 - 60 = 120
x = 120/3 = 40
So m<B = 40 and m < A = 80 degrees.
