surface area of a rectangular prism with a base length of 70 mm^2, perimeter of the base is 50 mm. The height of the prism is 9 mm. let a= base length, b = base width, c = height=9. ab= 70. a+b+9=50, or a+b=41, now bc+ca= c(a+b)=941=369 so suface area= 2(ab+bc+ca)= 2(70+369)=878 mm^2
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