Answer:
the answer is 12
Explanation:
to find the length we us this formula a²+b²=c²
a²+b²=c²
a²+(9)²=(15)²
a²+81=225
a²=225-81
a²=144
a=√144
a= 12 unit
12
Step-by-step explanation
so what I did is I divided 15 by 5 to get 3 also 9 divided by 3 equals 3 to so you could of also done that.
then i multiplied to 4 x 3 to get the missing side length which equals 12
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