Find the area of a triangle, whose sides are 6 cm, 0.08 m and 4 cm.
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Correct answer: D
Explanation
The correct answer is option 4 i.e. 3 cm2.
Convert all sides to cm: 0.08 m = 8 cm
Sides: 6 cm, 8 cm, 4 cm
Use Heron's formula: s = (6 + 8 + 4)/2 = 18/2 = 9 cm
Area = √[s(s − a)(s − b)(s − c)]
= √[9 × (9 − 6) × (9 − 8) × (9 − 4)]
= √[9 × 3 × 1 × 5]
= √135 ≈ cm²