Question

the equation $p = 3s$ represents the perimeter $p$ of an equilateral triangle with side length $s$. what is the perimeter of an equilateral triangle with side length 7 mm?
the perimeter is $square$ mm.

Explanation:

Step1: Identify the formula and given value

The formula for the perimeter \( P \) of an equilateral triangle is \( P = 3s \), and the side length \( s = 7 \) mm.

Step2: Substitute the value of \( s \) into the formula

Substitute \( s = 7 \) into \( P = 3s \), so \( P = 3\times7 \).

Step3: Calculate the result

\( 3\times7 = 21 \).

Answer:

21