Perimeter and Circumference 
Here is a triangle. A triangle only has three sides, but you find the perimeter the same way you find the perimeter of squares and rectangles, add the sides together. Find the perimeter of this triangle.
The sides are labeled 7, 7, and 5. So we have 7 + 7 + 5 = 17. The perimeter is 17 cm (centimeters)
