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Mathematics 9 Online
OpenStudy (anonymous):

Check my answer please?

OpenStudy (anonymous):

Pyramid A is a square pyramid with a base side length of 18 inches and a height of 9 inches. Pyramid B has a volume of 3136 cubic inches. How many times bigger is the volume of pyramid B than pyramid A? What is the percent change from pyramid A to pyramid B? Provide an explanation and proof for your answer to receive full credit

OpenStudy (anonymous):

Pyramid A's formula is 1/3(base)(height). V=1/3(18)(9)=54 cubic inches. The volume of Pyramid B is 3136 cubic inches.

OpenStudy (anonymous):

Did I do pyramid A's equation right?

OpenStudy (anonymous):

No you only took the length of a side not the base

OpenStudy (anonymous):

Becuase then 3136/54= 58.07

OpenStudy (anonymous):

Take the total area of the base which is 18 times 18

OpenStudy (anonymous):

oh i have to square it?

OpenStudy (anonymous):

Yeah!

OpenStudy (anonymous):

so its 972

OpenStudy (anonymous):

then divide volume of Pyramid B by 972 and you're good!

OpenStudy (anonymous):

then 3136/972=3.226 then X 100= 322%

OpenStudy (anonymous):

YEP! GOOD JOB!!!

OpenStudy (anonymous):

Thank you!

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