Question

The length of the hypotenuse of a 30°–60°–90° triangle is 9. Find the perimeter.

Can I have an answer and explanation?

Answer 1

the perimeter of any figure, is all its sides summed up

now, notice the picture below, using the 30-60-90 rule, that's "x"

now, get the other sides, since you know what "x" is, and sum them up, that's the perimeter