Question

Help! This is a 45 45 90 triangle

Answer 1

The 2nd one

Explanation:

The ratio of the sides of 45-45-90 triangles is a:a:a
`√(2)`. 9 would be the side that is equal to a
`√(2)`, so to find what a is you have to do 9 divided by
`√(2)`. The way you do this is make it the fraction
`(9)/(√(2))` and multiply that by
`(√(2))/(√(2))` so you would get
`(9√(2))/(2)`, which is the second one