Pre-Algebra

What is the length of the diagonal for the rectangular prism to the nearest whole unit?
LENGTH:12 cm
WIDTH:4 cm
HEIGHT:9 cm

A.16 cm
B.15 cm
C.13 cm
D.10 cm

i thinks its c. i think...

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  1. i really need help please. i'll be patient but i am in a little bit of a rush.

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  2. @Writeacher, @Reed

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  3. As you know, the diagonal of a 2-D rectangle is

    √(x^2+y^2)

    Similarly, the diagonal of a rectangular prism is

    √(x^2+y^2+z^2)

    So, since you have x,y,z just plug them in:

    √(144+16+81) = √241 = 15.52

    Looks like B to me.

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  4. One question what do you divide by once you add all the numbers together I know the formula but then it doesn't tell me what to divide by?

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  5. You would round up to 16 if its 15.52, so wouldn't it be A?

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  6. 15.52 is does not equal 15 it equals 16 because .52 rounds up to 1

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  7. bruh

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  8. It kinda seems like it's 16 but that's just me

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