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The perimeter of a rhombus is 100 cm and one of its diagonals is 40 cm. Its area (in cm²) is
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- 1200
- 1000
- 600
- 500
- 1200
Correct Option: C
Using Rule 12,
BD = 40 cm
BE = 20 cm
AE = x cm
| AB = | = 25 cm | |
| 4 |
∴ From ∆ ABE,
AE = √25² - 20²
= √45 × 5 = 15cm
∴ AC = 30 cm
| Area of rhombus ABCD = | d1d2 = | × 40 × 30 = 600 sq. cm | ||
| 2 | 2 |
