Question

please help me on this one:

A leather coin purse has the shape of a triangle. Two sides are equal in length and the third side is 3 centimeters shorter than on and one half times the length of the equal sides. The perimeter is 28.5 centimeters. Find the lengths of the sides.

Answer 1

\[perimeter=\sum_{}^{} legs\]
\[28.5=x+x +x/2\]
\[x=11.4\]
\[l _{1}=l_{2}=11.5cm\]
\[l_{3}=11.5/2=5.75\]

Answer 2

\[perimeter=\sum_{}^{} legs\]
\[28.5=x+x +x/2\]
\[x=11.4\]
\[l _{1}=l_{2}=11.5cm\]
\[l_{3}=11.5/2=5.75\]