**Problem 1.**What is the perimeter measure of an equilateral triangle that has a side measure of 4 units?

Step 1. We will use the formula 3s (s= one side length)

Step 2. 3 x 4 = 12 units

**Problem 2.**This one is a little more challenging.

What is the perimeter measure of an equilateral triangle with a height of 6 units?

Step 1. The height measure cuts the equilateral triangle into two 30-60-90 triangles.

The altitude becomes the long leg so let’s work backwards.

Step 3. Now we have half the distance of one side. The whole length equals

Step 4. Apply the perimeter formula of 3xside

For more information please see Perimter Formulas