Asked by Anonymous

A pyramid has a height of 5 in. and a surface area of 90 in ^2. Find the surface area of a similar pyramid with a height of 10 in. Round to the nearest tenth, if necessary.
A.360 in. ^2
B.180 in. ^2
C.22.5 in. ^2
D.3.6 in. ^2
I think the answer is A but I don't know how to write it down on paper to how I get that answer please help me. And am I even right? Thanks in advance.
Answered by Reiny
follow the same method I showed you in your other post with a similar concept
Except here you have areas instead of volumes

Hint: areas of similar shapes area proportional to the square of their corresponding sides.
Answered by Anonymous
I'm confused can you please show me how to work it out on paper. Thank you.
Answered by Reiny
90/x = 5^2/10^2
90/x = 25/100 = 1/4
x = 360
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