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Posted by **Brittany** on Friday, April 1, 2011 at 9:40pm.

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S | \ R

What is the length of hypotenuse in triangle QRS. Round to the nearest tenth.

- math-triangles -
**Reiny**, Friday, April 1, 2011 at 9:49pmYou could have just said:

Triangle QSR is right-angled with

angleQ=40°, and angleS = 90°

From your description I cannot tell if QS=7.8 or SR = 7.8

I will guess that SR=7.8

then sin40° = 7.8/QR

QR = 7.8/sin40 = 12.135

if QS = 7.8

then cos40 = 7.8/QR

QR = 7.8/cos40 = 10.18

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