Equilateral triangle

Calculate the area of an equilateral triangle with circumference 72cm.

Correct answer:

S =  249.4153 cm2

Step-by-step explanation:

o=72 cm  a=o/3=72/3=24 cm  S=ah/2 h=3/2 a  S=a2 3/4=242 3/4=144 3=249.4153 cm2

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