The perimeter of an equilateral triangle is 60 m. The area is
Area of an equilateral triangle of side a is given by 
Perimeter of triangle = 60m (given)
⇒ a + a + a = 60
⇒ 3a = 60
⇒ a = 20m
Area(Δ) = 
Hence the correct option is (D).
2
The perimeter of an equilateral triangle is 60 m. The area is
Area of an equilateral triangle of side a is given by
Perimeter of triangle = 60m (given)
⇒ a + a + a = 60
⇒ 3a = 60
⇒ a = 20m
Area(Δ) =
Hence the correct option is (D).