The length of each side of an equilateral triangle is decreased by 3 inches, so the perimeter is now 21 inches. what is the original length of each side of the equilateral triangle

The Perimeter then would be 30 Inches!

:V

An equilateral triangle has equal sides

so if you divide the perimeter by 3 you would get the length for all of the sides

21/3 = 7

since it said it was decreased by 3 inches you add 3 inches back

7 + 3 = 10

so the original length of one side of the triangle is 10 inches