We see a right triangle here. Use the Pythagorean Theorem: a^2+b^2=c^2 a & b=legs c=hypotenuse a^2+15^2=20^2 a^2+225=400 a^2=175 a=13.2287565553 a=13.2 The missing side is 13.2cm
By calculus or elementary geometry, we know that the formula for the volume of a cone, given pi (the constant), its height h and its radius r is: Lets solve this relation for the radius: Now we have found a general formula that gives us the radius of a cone, given its volume and height. We need only substitute height (20in) and pi=3.14 to get the numerical equation: r=0.2185*