find the area of an area of an equilateral triangle (regular 3-gon) with the given measurement 9-inch perimeter. A=sq. in.
1 answer:
Answer:
Area = side^2 * sqrt(3) / 4
If 9 inch perimeter then side = 3
Area = 3^3 * sqrt(3) / 4
Area = (9 / 4) * sqrt(3)
Area = 3.897114317 square inches
Step-by-step explanation:
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