Question

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

Answer 1

@legendarysadist

Answer 2

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

Answer 3

so do I subtract 18-4

Answer 4

See those squares? 18 squares minus 4 squared.

Answer 5

2.242640687119285

Answer 6

\[\large 18^{2}~=~18 \times 18\\\large 4^{2}~=~4 \times 4\]

Answer 7

so do I multiply 324x6?

Answer 8

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

Answer 9

17.549

Answer 10

And that would be it.

Answer 11

17.5