We have a right triangle, we can use the Phytagorean Theorem in order to find the missing side
[tex]c^2=a^2+b^2[/tex]
we have
c=15
a=12
b?
we clear b of the formula above
[tex]b=\sqrt[]{c^2-a^2\text{ }}[/tex]
then we substitute the values
[tex]\begin{gathered} b=\sqrt[]{15^2-12^2} \\ b=9 \end{gathered}[/tex]
the answer is
b=9 yards
