6 and 3/8
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.
Find the area of an equilateral triangle that has a perimeter of 21 inches. Round the answer to one decimal place.
2.5 inches
6 inches
4 inches x 3 sides = 12 inches for the perimeter.
9 inches
It is: 3*9 = 27 inches