Best Answer

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

Q: Find the area of an equilateral triangle that has a perimeter of 21 inches. round the answer to one decimal?

Write your answer...

Submit

Still have questions?

Continue Learning about Geometry

21.2 sq inches.

4 inches x 3 sides = 12 inches for the perimeter.

3.897 square inches.

12 inches

(6.06 x 3.5) = 21.20 sq in.

Related questions

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

21.2 sq inches.

the answer is 32

18 inches and it is an equilateral triangle

The perimeter of an equilateral triangle with a side length of 4 inches is 12 inches. Each side of an equilateral triangle is equal in length, so the perimeter is found by multiplying the side length (4 inches) by 3.

6in.

21.20

12 inches

The perimeter is the sum of all sides. An equilateral triangle has three sides of equal length. So if one side is 5 inches, and we have three of these, we get a perimeter of 15 inches.

2.5 inches

6 inches

4 inches x 3 sides = 12 inches for the perimeter.