the area of an equilateral triangle is 81√3sq.cm , find its side
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Answer:
18 cm
Step-by-step explanation:
Area of equilateral triangle = side²√(3)/4
Let the side of this triangle be a.
= > Area = 81√3 cm²
= > a²•√(3)/4 = 81√3 cm²
= > a²/4 = 81 cm²
= > a² = 81 * 4 cm²
= > a² = 324 cm²
= > a = √324 cm²
= > a = 18 cm
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