Answer:
pythagoras theorem
so we have a and b
12 and 9
so ...
take the square root to find c, since 225 is c^2
so √225 = c = 15
B) 15
Explanation:
This is a right triangle and in right triangles the square length of hypotenuse is equal to the sum of square length of base and side length
9^2 + 12^2 =√hypotenuse
225 = √hypotenuse
15 = hypotenuse
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