Posted by **hard questions PLZZ answer!** on Thursday, November 29, 2012 at 4:40pm.

6.

The length of the hypotenuse of a right triangle is 15 cm. The length of one leg is 9 cm. Find the length of the other leg.

6 cm

12 cm

17 cm

144 cm

- math -
**Steve**, Thursday, November 29, 2012 at 4:45pm
9^2 + x^2 = 15^2

81 + x^2 = 225

x^2 = 144

x = 12

or, since you are familiar with the 3-4-5 right triangle, you might have noticed that

9 = 3x3

15 = 3x5

so the other leg would be 3x4 = 12

- math -
**Ms. Sue**, Thursday, November 29, 2012 at 4:45pm
Use the Pythagorean Theorem.

a^2 + b^2 = c^2

a^2 + 9^2 = 15^2

Solve for a.

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