Question

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
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.
2(84.00909)+108=276.01818

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