The sides of a cube measures 8cm. If the surface area of the cube is the same as a ball, what is the radius of the ball? Round to the nearest whole number.	Choose one
A) 3 B) 8 C) 7 D) 6 E) 5
First calculate the surface area of the cube. The cube is made of 6 squares with the sides measuring 8cm each. The surface area of 1 side of the cube is 64cm. Multiply the surface area of the 1 side by 6 will give you the cube's total surface area. The cubes total surface area is 384cm. Now we know that the surface area of the ball is 384cm. To find out the surface area of a sphere you need to square the radius, then multiply by Pi, and multiply by the number 4. Going backwards to find the radius - you will need to dived the surface area by 96. Then divide by Pi. Then determine the square root of the answer. The radius is 5.527. Rounding to the nearest whole number the radius is 6. The correct answer is (6).
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The sides of a cube measures 8cm. If the surface area of the cube is the same as a ball, what is the radius of the ball? Round to the nearest whole number.