we know that
An isosceles triangle is a triangle with two equal sides and two equal angles
Let
x-------> the length of the equal sides
y-----> the length of the base
-----> equation A
The perimeter of an isosceles triangle is equal to


so
------> equation B
substitute equation A in equation B
![15.6=2x+[x-3]](https://img.qammunity.org/2018/formulas/mathematics/high-school/8a4t97lxm06shez7rbvt1ofktfu78hdw1l.png)



Find the value of y


therefore
the answer is
The dimensions of the triangle are


