# SOLUTION: Hey tutors,I needed a little help in surface area. I know how to find surface ares in different shapes.Although,I dont know how to find missing parts of it (Height,Length etc.) so

Algebra ->  Algebra  -> Surface-area -> SOLUTION: Hey tutors,I needed a little help in surface area. I know how to find surface ares in different shapes.Although,I dont know how to find missing parts of it (Height,Length etc.) so       Log On

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 Geometry: Area and Surface Area Solvers Lessons Answers archive Quiz In Depth

 Click here to see ALL problems on Surface-area Question 436024: Hey tutors,I needed a little help in surface area. I know how to find surface ares in different shapes.Although,I dont know how to find missing parts of it (Height,Length etc.) so here it is: The surface area of a rectangular prism is .The width is 11cm and the length is 20cm.What is the height of the rectangular prism. What iv'e tried: formula ....Yea...I'm getting nowhere -_-...Thanks!Answer by ankor@dixie-net.com(15648)   (Show Source): You can put this solution on YOUR website!The surface area of a rectangular prism is 812 sq/cm. The width is 11cm and the length is 20cm. What is the height of the rectangular prism. : the surface area formula 2(L*W) + 2(L*H) + 2(W*H) = S.A. so we have 2(20*11) + 2(20*H) + 2(11*H) = 812 Simplify, divide by 2 (20*11) + (20*H) + (11*H) = 406 220 + 20H + 11H = 406 31H = 406 - 220 H = H = 6 : : I'll let you check this in the surface area formula