2916(3.14)=3.14(r*r)*36

Solution for 2916(3.14)=3.14(r*r)*36 equation:

Simplifying
2916(3.14) = 3.14(r * r) * 36

Multiply 2916 * 3.14
9156.24 = 3.14(r * r) * 36

Multiply r * r
9156.24 = 3.14(r2) * 36

Reorder the terms for easier multiplication:
9156.24 = 3.14 * 36r2

Multiply 3.14 * 36
9156.24 = 113.04r2

Solving
9156.24 = 113.04r2

Solving for variable 'r'.

Move all terms containing r to the left, all other terms to the right.

Add '-113.04r2' to each side of the equation.
9156.24 + -113.04r2 = 113.04r2 + -113.04r2

Combine like terms: 113.04r2 + -113.04r2 = 0.00
9156.24 + -113.04r2 = 0.00

Add '-9156.24' to each side of the equation.
9156.24 + -9156.24 + -113.04r2 = 0.00 + -9156.24

Combine like terms: 9156.24 + -9156.24 = 0.00
0.00 + -113.04r2 = 0.00 + -9156.24
-113.04r2 = 0.00 + -9156.24

Combine like terms: 0.00 + -9156.24 = -9156.24
-113.04r2 = -9156.24

Divide each side by '-113.04'.
r2 = 81

Simplifying
r2 = 81

Take the square root of each side:
r = {-9, 9}