Advertisements
Advertisements
Question
The lengths of the sides of a triangular field are 20 m, 21 m and 29 m. The cost of cultivating the field at ₹ 9 per m2 is ______.
Options
₹ 2610
₹ 3780
₹ 1890
₹ 1800
MCQ
Fill in the Blanks
Advertisements
Solution
The lengths of the sides of a triangular field are 20 m, 21 m and 29 m. The cost of cultivating the field at ₹ 9 per m2 is ₹ 1890.
Explanation:
`s = 1/2 (20 + 21 + 29) m = 35 m`, (s – a) = 15 m, (s – b) = 14 m and (s – c) = 6 m.
∴ Area = `sqrt(35 xx 15 xx 14 xx 6) m^2`
= (7 × 5 × 3 × 2) m2
= 210 m2
Required cost = ₹ (210 × 9)
= ₹ 1890
shaalaa.com
Is there an error in this question or solution?
