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How do I write a formula and solve problem 15? (For 6th grade math

How do I write a formula and solve problem 15? (For 6th grade math-example-1
User Piko
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Find the surface area by base x height x2 for the triangles then. 8 squared plus 10 squared equals hyp squared which would give the slope measure. so the multiply that by 8 to get the slope area and the 8 x 8 to get the back hope this helps. 
User Steve Gelman
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