cjbitz01
Answered

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The area of the base of a prism is 21 cm2. The perimeter of the base is 20 cm. The height of the prism is 8 cm.

What is the surface area of the prism?

Sagot :

icarlson
well fist you would take the two ends and add them so 21+21= 42cm²    then find the other four sides two would equal 24 cm² and the other two would equal 56cm² this is because the two numbers that multiply to 21 and add to 10 (it is 10 not 20 because there are four sides and it must be divided by two to find just two numbers) are 3 and 7. so the surface area ends up being 21+21+56+56+24+24 which equals 202cm²
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