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What is the value of x

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What is the value of x [#permalink] New post 15 May 2018, 09:34
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Attachment:
triangle.jpg
triangle.jpg [ 11.68 KiB | Viewed 230 times ]


What is the value of x in the figure above?

A. 12

B. 12.5

C. 15

D. \(9 \sqrt{3}\)

E. 18
[Reveal] Spoiler: OA

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Re: What is the value of x [#permalink] New post 17 May 2018, 00:12
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The figure has two right-angle symbol drawn on to it.
we can find the solution to the problem by focusing on only the big triangle as such we have three sides; 20,25 and x

Use the Pythagoras theorem to find the value of x:

\(x^2 + 20^2 = 25^2\)

solve for x; x = 15
option C
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Re: What is the value of x   [#permalink] 17 May 2018, 00:12
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