Question

The perimeter of an equilateral triangle is p and the length of a side is s.

The formula for s is s = p = 3
Find the length of a side when the perimeter is 21 cm. = cm
Write down a formula for p in terms of s. p =​

Answer 1

s=7

p=3s

Explanation:

The perimeter is the side length times 3

So the equation would be p=3s

Plug in 21 for p

21=3s

That means s=7