A rectangle has length 8 inches and width 4 inches. What is its perimeter?

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Multiple Choice

A rectangle has length 8 inches and width 4 inches. What is its perimeter?

Explanation:
Perimeter is the distance around the shape, so for a rectangle you go around using two lengths and two widths. The formula is P = 2(L + W). With length 8 inches and width 4 inches, P = 2(8 + 4) = 2(12) = 24 inches. That value matches the correct total around the rectangle. The other numbers come from common miscounts: 20 happens if you double the length and add the width (2L + W) instead of doubling both dimensions; 32 would be from miscounting or doubling inappropriately; 16 would come from counting only the length twice and ignoring the width.

Perimeter is the distance around the shape, so for a rectangle you go around using two lengths and two widths. The formula is P = 2(L + W). With length 8 inches and width 4 inches, P = 2(8 + 4) = 2(12) = 24 inches. That value matches the correct total around the rectangle. The other numbers come from common miscounts: 20 happens if you double the length and add the width (2L + W) instead of doubling both dimensions; 32 would be from miscounting or doubling inappropriately; 16 would come from counting only the length twice and ignoring the width.

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