Area = square units
The bottom side of the flag measures 5 feet because the triangle is . Because , the trigonometric triangle formula is used to calculate that the area is (5)(5)sin(36°) ≈ 7.35 square feet. Recalling that this triangle is isosceles, we can write the area equation to solve for x.
= (x)(5)sin().
= (x)(5)sin().
Solving for x and adding this value to the length of the other sides, the perimeter ≈ (rounded to the nearest tenth).
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