Answer:
25 m
Explanation:
Use the Pythagorean Theorem.
a^2+b^2=c^2
Or just know you are finding the hypotenuse and use c=sqrt(a^2+b^2)
If you were finding a leg use a=sqrt(c^2-b^2).
So sqrt(15^2+20^2)
=sqrt(225+400)
=sqrt(625)
=25
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