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 a pyramid has a square base measuring 10 inches on each side. it has 4 faces that are congruent isosceles triangles. the height of each tria

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a pyramid has a square base measuring 10 inches on each side. it has 4 faces that are congruent isosceles triangles. the height of each triangle is 13 inches. find the surface area of the pyramid

 Nov 25, 2014

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 #2
avatar+128448 
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There are four triangles each having an area = bh/2 = (10*13)/(2) in2

So......(4)(10*13)/2 in2   = 260 in2

And the area of the base = 102   = 100in2

So...the total surface area =  [ 260 + 100]in2 = 360 in2

 

 Nov 25, 2014

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 #1
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i have no idea kid sorry

 Nov 25, 2014
 #2
avatar+128448 
+5
Best Answer

There are four triangles each having an area = bh/2 = (10*13)/(2) in2

So......(4)(10*13)/2 in2   = 260 in2

And the area of the base = 102   = 100in2

So...the total surface area =  [ 260 + 100]in2 = 360 in2

 

CPhill Nov 25, 2014

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