Find the area of an equilateral triangle (regular 3-gon) with the given measurement.

6-inch side.

A = sq. in.

Draw a straight line from the mid point of one side to the opposite vertex.

Use the Pythagorean Theorem to find the length of this line. Let b = this line (the height).

a^2 + b^2 = c^2
3^2 + b^2 = 6^2
9 + b^2 = 36
b^2 = 27
b = 5.2

Now use this formula to find the area of this triangle.

A = 1/2bh

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What is the area of a equlateral triangle with the measurement of 6-inch side?

To find the area of an equilateral triangle with a 6-inch side, you can use the formula:

A = (s^2 * sqrt(3)) / 4

where A represents the area and s represents the length of one side of the equilateral triangle.

Substituting the given measurement, we get:

A = (6^2 * sqrt(3)) / 4

A = (36 * sqrt(3)) / 4

Now, let's simplify the expression:

A = (9 * sqrt(3))

So, the area of an equilateral triangle with a 6-inch side is 9√3 square inches.