Question

A right triangle has legs of 30m and 40m. What is the PERIMETER of the triangle?

choices:
A.) 120m

B.) 70m

C.) 1200m

D.) 50m

Answer 1

A

Explanation:

We know that we are dealing with a right triangle. Look at the legs given to us, 30m and 40m. That looks familiar doesn't it? In fact, this quite resembles the 3-4-5 special right triangle.

We can simply scale the legs by 10 to find the last side of the triangle.

`3*10=30\\4*10=40`

and therefore, the last side of the right triangle must be:

`5*10=50`

Great! Now we have all the sides of the right triangle. We just have to add them up:

`30+40+50=120`

Therefore, the perimeter of the triangle is 120m. A.

I hope this helps! Let me know if you have any questions :)