Answer: 252
Explanation:
First we need to find y.
Because there are three marks indicating that the measure of the angles are congruent, we know that all sides of the triangle are equal, so we can use that to find y.
5y-6=4y+12
y=18
Now substitute y into all the side equations:
5y-6 = 5(18)-6 = 84
4y+12 = 4(18)+12 = 84
6y-24 = 6(18)-24 = 84
Now that we know all the sides, just add these values together to get your perimeter:
84+84+84= 252
