Michael J. answered 04/12/16
Tutor
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Effective High School STEM Tutor & CUNY Math Peer Leader
An isosceles triangle has two congruent sides and two congruent angles. The perimeter of a triangle is the sum of its sides.
Let x = missing side
Perimeter = 32.7
Using the information, we can write an equation to represent the perimeter.
2x + 9.5 = 32.7
Solve for x from the equation to get your missing side. I'll let you finish up here.