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11. The height of an equilateral triangle measures 9cm. Find its area correct to 2 places of decimal |
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Answer» Step-by-step explanation: Hi friend -------------- Your answer -------------------- Height of an equilateral triangle = 9 cm Now, --------- √3/2 × side = Height √3/2 × side = 9 => side = (9 × 2)/√3 => Side = 3√3 × 2 = 6√3 cm Again, ----------- Area = √3/4 × (side)² = [√3/4 × 6√3 × 6√3] cm² = 27√3 cm² = (27 × 1.732) cm² [Taking √3 = 1.732] = 46.764 cm² = 46.76 cm² (correct to 2 decimal places.) |
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