Question

the perimeter of an equilateral triangle with side s is 3s. diana is making a decorative pillow for her living room. the pillow is shaped like a triangle with lace around the edges. each side of the pillow is 7 inches long. what is the perimeter of the pillow? write your answer as a whole number or decimal. inches

Explanation:

Step1: Substitute the side length into the formula

The formula for the perimeter of an equilateral triangle is \(P = 3s\), where \(s = 7\) inches.
So, \(P=3\times7\).

Step2: Calculate the result

\(3\times7 = 21\).

Answer:

21