Solve S= 3.14RL + 3.14R^2 for L

Answer 1

3.14 R L = S - 3.14 R^2

L = (S - 3.14 R^2) / 3.14 R

Answer 2

divide by 3.14R ... S / (3.14R) = L + R

subtract R ... [S / (3.14R)] - R = L