Question

I really need help with this question

find the difference in the two surface areas of the two figures shown

Answer 1

the choices are provided in the image
I tried to solve it but I didn't get the correct answer I guess

Answer 2

what was your answer?

Answer 3

I got 253.50

Answer 4

its not correct

Answer 5

OMG that is hard i dont know im sorry

Answer 6

its ok, nvm :)
thanks for trying though :)

Answer 7

np

Answer 8

Since u need to find the height of both square pyramids. This website might help http://www.calculatorsoup.com/calculators/geometry-solids/pyramid.php.

Answer 9

The left is a square pyramid right?

Answer 10

Left one is a squared pyramid the right one is a rectangular pyramid

Answer 11

I got around 427

For the left, the base=144
And use pythagoereom theorem to find height of triangle,
6^2 + x^2 =15^2 and the height of triangle=3sqrt21
Then use it to find area of triangles
1/2 (12)(3sqrt21) x4(becuz there r 4 triangles) +144=SA of entire pyramid

Answer 12

Do the same on the right
Base=288
For triangle with base 12 find the height using pyth. Again
6^2 +x^2 =20^2
x=2sqrt91 and use this to find area of the side triangles and get around 24sqrt91
Do the same for the front and back
12^2 +x^2 =20^2
x=16
And the area =1/2(16)(24) x2=384
Add them all up.
288+24sqrt91+384=SA of right pyramid
And subtract this^ with what you got on the left and should get around 427

Answer 13

thank you so much for your help, this was really helpful
t

Answer 14

thanks @nikato

Answer 15

No problem. Glad to help