Question

Which equation can be used to find the unknown length, a, in this triangle?

15 m
17 m
3+15² = 172
152 +172 - a
2² +15= 172
at 15² = 17²

Answer 1

Yes it is A

Explanation:

Answer 2

Here is the complete question.(attachment)

The correct choice is
`a^2+15^2=17^2`

Explanation:

We will apply the Pythagoras formula to calculate the perpendicular length (a).

Pythagoras formula
`=(base)^2+(perpendicular)^2=(Hypotenuse)^2`

The right angle is formed between
`a` and
`15\ m` length.

So
`17\ m` is the hypotenuse opposite to right angle is the longest side and called the hypotenuse.

So

`(a)^2+(15)^2=17^2`

`a=√(17^2-15^2)= 8\ m`

So the measure of side length
`a` is
`8\ m`.

That can be calculated from the option A that is
`(a)^2+(15)^2=17^2`.

Note:Please don't look to the marked answers that was wrong in the attachment.