Question

Ms. Kent measures the perimeter of a common shape. One of the sides is 7 centimeters, and the perimeter is

21 centimeters. If all of the sides are the same length, what shape does Ms. Kent measure? Explain.

Answer 1

Explanation:

If the perimeter of a shape is 21 centimeters and one side is 7 centimeters, then we can find the total number of sides by dividing the perimeter by the length of one side:

Number of sides = Perimeter / Length of one side

Number of sides = 21 cm / 7 cm

Number of sides = 3

This means that the shape has 3 sides, which makes it a triangle.

Since all sides of the triangle have the same length, we can call it an equilateral triangle. In an equilateral triangle, all sides have the same length, and all angles are 60 degrees.