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.

Question

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.

Answer 1

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.

Answer 2

I'm confused can you please show me how to work it out on paper. Thank you.

Answer 3

90/x = 5^2/10^2
90/x = 25/100 = 1/4
x = 360