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

Given:

Rate = Rs 9 per m²

Side a = 20 m

Side b = 21 m

Side c = 29 m

Area of a scalene triangle = √(s(s-a)(s-b)(s-c))

Where,

⇒ s = 35 m

Now,

Area of triangular field = √(35 m × (35-20)m × (35-21)m × (35-29)m)

= √(35 m × 15 m × 14 m × 6 m)

= √44100 m²

= 210 m²

Total Cost = 210 m² × Rs 9 per m²

= Rs 1890