the base of an isosceles triangle measures 108 feet and forms an angle of 55 degrees with one equal sides. find the perimeter of the triangle

Answer 1

Since there are two angles of 55°, the vertex angle is 70°. So, each of the two matching sides has length

54/cos55°

Now you can add up the sides to get the perimeter.

Answer 2

2(84.00909)+108=276.01818