Grade 6 - Mathematics 9.10 Perimeter of a Triangle

Points to remember:

Perimeter of a triangle:

The sum of the measures of AB, BC and CA is called the perimeter of the triangle ABC.

Perimeter of triangle ABC = BC + CA + AB = a + b + c, where a, b and c are the lengths of the sides BC, CA and AB.

Example:

The length of sides of a triangle are given by a = 2 cm, b = 5 cm, and c = 4 cm. Find the perimeter of the triangle formed by the lines segments BC, CA, and AB.

Answer:
Perimeter of the triangle = a + b + c = 2 + 5 + 4 = 11 cm

Directions: Read the above review points carefully and answer the following questions:

Illustrate each of the above review points by drawing a triangle.

Explain in your own words how to find the perimeter of triangles.