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gabbyalicorn
 one year ago
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?
gabbyalicorn
 one year ago
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?

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anonymous
 one year ago
Best ResponseYou've already chosen the best response.0what is the shape of prism?

gabbyalicorn
 one year ago
Best ResponseYou've already chosen the best response.0there is no shape that they gave me

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0let it be rectangular and x and y be its sides. 2(x+y)=20 x+y=20/2=10 y=10x xy=21 x(10x)=21 10xx^2=21 x^210x+21=0 x^27x3x+21=0 x(x7)3(x7)=0 (x7)(x3)=0 either x7=0,x=7,y=107=3 or x3=0,x=3,y=103=7 so length =7 cm breadth=3 cm surface area=2*21+20*8=? cm
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