We know that the sum of the interior angles of a triangle equals 180, then,in this case we have the following equation:

then, solving for b, we get:

now that we have that b = 41, we can find the measure of each angle:
10, 20, 30, 40, 50, 60, 70, 80, 90, 100
Lateral Area of a cylinder is ; 2πR.H
R=12 mm and H= 15 mm
Then LATERAL area = 2π(12)(15) =48π ≈ 150 mm²
Are there any choices that i can help with to solve the work problem
10(-1c+7)-3c
(-10c+70)-3c
-13c+70 is your answer