The sides of a triangular park are 35 m 53 m and 66 m. The cost of levelling the park at the rate of `9.25/m2 is:
Show answer & explanation
Correct answer: B
Explanation
The correct answer is Option 2 i.e. `8547
| Understanding | Application |
| Tricks |
The perimeter of the triangle(s) = (35 + 53 + 66)/2 = 154/2 = 77 |
| Now |
Area of the triangle = √s (s - a) (s - b) (s - c) = √77 (77 - 35) (77 - 53) (77 - 66) = √77 (42) (24) (11) = √11× 7 (2 × 3 × 7) (2 × 2 × 2 × 3) (11) = 11 × 7 × 2 × 2 × 3 = 924 |
| Hence |
Total cost 924 × 9.25 = 8547 |