Posted by **Kitralia Brown** on Friday, November 30, 2012 at 5:14pm.

Which of the triangles described in the table is a right triangle?

Triangles: Q, R, S, T

Side 1: Q = 25, R = 26, S = 25, T = 25

Side 2: Q = 20, R = 20, S = 20, T = 26

Side 3: Q = 15, R = 26, S = 1,025, T = 650

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**Kitralia Brown**, Friday, November 30, 2012 at 5:14pm
Thanks to whoever can help me answer this.

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**Sammy**, Friday, November 30, 2012 at 5:23pm
I think Side 2? I think. Your Welcome :)

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**Sammy**, Friday, November 30, 2012 at 5:23pm
Maybe.

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**Kitralia Brown**, Friday, November 30, 2012 at 5:26pm
No, the triangles are named Q, R, S and T.. there are three sides to each of them; Side 1, Side 2 and Side 3.

But which one is a right triangle?

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**Sammy**, Friday, November 30, 2012 at 5:28pm
ohh Sorry :( my bad

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**Kitralia Brown**, Friday, November 30, 2012 at 5:34pm
It's okay, thanks for trying. :)

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**Sammy**, Friday, November 30, 2012 at 5:42pm
no problem sorry again have a nice day =)

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**Reiny**, Friday, November 30, 2012 at 6:01pm
ahh, so the triangles are grouped with sides:

25,20,15 and

26,20,26 and

25,20,1025 and

25,26,650

we can immediately rule out the last 2 groups since they don't even form any kind of triangle

So to be right-angled

a^2 + b^2 = c^2 , where c is the longest side, the hyppotenuse

is 20^2 + 15^2 = 25^2 ?

400 + 225 = 625 ? YES

is 26^2 + 20^2 = 26^2 , clearly NOT

so 20, 15 , and 25 will form a right-angled triangle.

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**Kitralia Brown**, Friday, November 30, 2012 at 6:03pm
Ah, so it is Q! That is was I assumed, but I wasn't sure... I'm not too good at math. Thank you so much! :)

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