Answer:
Given
Height of equilateral triangle (h) = 20 cm
Given sides of triangle = 17 cm . 8 cm . 15 cm
Area of an equilateral triangle with height (h) = h2/√3
∴ Area of equilateral triangle = (20 × 20)/√3
Area of equilateral triangle = 230.940 sq.cm
According to the Pythagoras theorem
(15)2 + (8)2 = (17)2
Since it is a right angle triangle
∴ Area of a triangle (A) = (1/2) ×b ×h
A = 0.5 × 15 × 8
A = 60 sq.cm