Find the missing dimension in the figure with given surface area...
Answers
With Volume
Find Values
Obtain the length, height and volume of a rectangular prism. For example, say the length is 20 inches, the height is 20 inches and the volume is 4,000 cubic inches.
Multiply Length by Height
Multiply the length by the height. In this example, work out 20 x 20 = 400 square inches.
Calculate Width
Divide the volume by the product of the length and height to calculate the rectangular prism's width. Work out 4,000 ÷ 400 = 10. The rectangular prism's width is 10 inches.
With Surface Area
Find Values
Obtain the length, height and surface area of a rectangular prism. For example, say the length is 10 inches, the height is 10 inches and the surface area is 400 square inches.
Multiply Length by Height
Multiply the length by the height, and then double the product. Work out 10 x 10 results = 100 square inches, then work out 100 x 2 = 200. The answer is 200 square inches.
Subtract from Surface Area
Subtract the doubled product of the height and length from the surface area. In this example, work out 400 - 200 = 200. The answer is 200 square inches.
Double Values
Double the length, double the height, then add the two products together. In this example, work out 10 x 2 = 20. Both the length and the height doubles are 20 inches. Work out 20 + 20 = 40. The answer is 40 inches.
Complete Division
Divide the difference from Step 3 by the sum from Step 4. Work out 200 ÷ 40 = 5. The width of the rectangular prism is 5 inches.