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3 years ago

Hey there! Can I get some help please ? Thanks!

Mathematics

1 answer:

Ivenika [448]3 years ago

5 0

The surface area is the sum of area of all faces of the shape

For the first shape:
four areas of four triangles + area of the square base

A= 4 (0.5*16*17) + (16*16) = 800 in^2

For the second shape:
area of the lateral cone + area of the circle base
A = 3.14*3* (9+64)^0.5 + 3.14 * 9 = 108.75 in^2

Hope that helps

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I initially got this one wrong, but after I saw the answer which is 80, I was able to solve it. But im not sure if this is the proper way of solving it, or if someone can suggest a more efficient way of solving it?

This is what I did, which was wrong:

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It seems like the correct answer is:

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If this is the most efficient way of solving, when do you know when to add them as opposed to multiplying them in this case?

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