Question

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The perimeter of an equilateral triangle is 54cm.find its area

Answer 1

Equilateral triangle ⇒ All sides are the same

length = 54 ÷ 3 = 18 cm

Formula: Area = 1/2 absin(c)

Area = 1/2 (18)(18) sin(60) = 81√3 cm² or 140.30 cm² (nearest hundredths)

Answer: 140.30 cm²

Answer 2

please keep your promise

equilateral triangle have three all sides are same hence it's one side is 54 /3=18
area of an equilateral triangle √3/4(side)^2=81√3