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Answer:
A
Step-by-step 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.
[tex]3*10=30\\4*10=40[/tex]
and therefore, the last side of the right triangle must be:
[tex]5*10=50[/tex]
Great! Now we have all the sides of the right triangle. We just have to add them up:
[tex]30+40+50=120[/tex]
Therefore, the perimeter of the triangle is 120m. A.
I hope this helps! Let me know if you have any questions :)