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I need to know more about the triangle, such as one or 2 of the angles, whether it is isosceles or equilateral, or whether the lengths share a certain ratio. For example, a triangle of sides 8,8 and 5 (perimeter of 21) will surely have a different area as compared to a triangle of sides 7,7 and 7 (perimeter of 21 as well)

Q: Find the area of a triangle that has a perimeter of 21 inches?

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You cannot. For a given area, an equilateral triangle will have the smallest perimeter but that perimeter can be increased - without limit - without increasing the area.

Area of a triangle in square units = 0.5*base*height

62.354 inches2

to find the area of a triangle you divide the base of the triangle by two and multiply your answer by the height .so your formula would be 1/2b times h to find the perimeter of a triangle u simply just add the sides.

Perimeter = 100 inches Area = 600 square inches

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Find the area of an equilateral triangle that has a perimeter of 21 inches. Round the answer to one decimal place.

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Area of equilateral triangle: 0.5*7*7*sin(60 degrees) = 21.2 square inches

21.20

The area of a given hexagon is equal to the area of an equilateral triangle whose perimeter is 36 inches. Find the length of a side of the regular hexagon.Click once to select an item at the bottom of the problem.

Yes, it does. Your triangle has an area of 12.285 square inches and a perimeter of 23 inches.

You cannot. For a given area, an equilateral triangle will have the smallest perimeter but that perimeter can be increased - without limit - without increasing the area.

Find the area of an equilateral triangle if its perimeter is 18 ft

3.897 square inches.

Area of a triangle in square units = 0.5*base*height

62.354 inches2