## anonymous one year ago Find the length of the unknown side. Round your answer to the nearest tenth. Image of a right triangle with a leg of 4, hypotenuse of 18, and second leg unknown. 16.5 17.5 18.5 22.0

1. anonymous

2. anonymous

Just use Pythagorean theorem. $\large 18^{2}~-~4^{2}~=~x^{2}$

3. anonymous

so do I subtract 18-4

4. anonymous

See those squares? 18 squares minus 4 squared.

5. anonymous

2.242640687119285

6. anonymous

$\large 18^{2}~=~18 \times 18\\\large 4^{2}~=~4 \times 4$

7. anonymous

so do I multiply 324x6?

8. anonymous

$\large (18 \times 18)~-~(4 \times 4)~=~x^{2}\\\large 324~-~16~=~x^{2}\\\large 308~=~x^{2}\\\large \sqrt{308}~=~x$

9. anonymous

17.549

10. anonymous

And that would be it.

11. anonymous

17.5