<h3><u>Given</u>:-</h3>
First side(a) of triangle = 17in.
Second side(b) of triangle = 13in.
Perimeter of triangle = 45in.
<h3><u>To Find</u>:-</h3>
Third side of the triangle.
<h3><u>Formula Used</u>:-</h3>
Perimeter of triangle = sum of all side(a+b+c).
<h3><u>Solution</u>:-</h3>
Perimeter of triangle = a + b + c.(putting the value of perimeter, side a and b from the above given)
Therefore, <u>third side = 15in.</u>
<u>To convert this value into feet we need to divide it by 12</u>, because there are 12 inches in a foot.
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Hope it helps you:)