What is the formula to find the circumference of a circle using the radius?

Solve the equation w^3 = 1,000 i honestly dont know how to punch this into a calculator pls

For each proportion find the unknown number x 1/5/8=×/15

Carmen begins her next painting on a rectangular canvas that is 82.7 cm long and has a area of 8,137.68 cm2. will the painting fit in a frame with an opening that is 82.7 cm long and 95 cm wide? explain