Q18 of 97 Page 786

The sides of an equilateral triangle is equal to the radius of a circle whose area is 154 cm². The area of the triangle is

Let the side = radius = x

Now,

Area of circle = πr²

⇒ x² = 49

⇒ x = 7 cm

Area of equilateral triangle =

The length of the sides of a triangular field are 20 m, 21 m and 29 m. The cost of cultivating the field at RS. 9 per m² is

The side of a square is equal to the side of an equilateral triangle. The ratio of their areas is

The area of a rhombus is 480 cm² and the length of one of its diagonals is 20 cm. The length of each side of the rhombus is

One side of a rhombus is 20 cm long and one of its diagonals measures 24 cm. The area of the rhombus is

The sides of an equilateral triangle is equal to the radius of a circle whose area is 154 cm2. The area of the triangle is