And isosceles triangle has a bird types angle of 21. 21°. the two sides of the triangle reach 17.91 feet long. find the area of a triangle.

Answer with explanation:

Two equal angles of Isosceles Triangle =21.21°

Two equal sides of Isosceles Triangle =17.91 feet

Third Angle of Triangle

Using Angle sum property of triangle⇒Which states that sum of three angles of triangle is 180°.

→21°.21'+21°.21'+Third Angle=180°

→42°.42'+Third Angle=180°

→Third Angle=180°-42°.42'

→Third Angle=137°.18'

⇒Area of triangle

=109.062 Square feet(Approx)

1/5^2 = 7.56/45