SaiBook.us Geometry

Lesson Example Discussion Quiz: Class Homework

Example

Title: Perimeter of Triangle(based on sides)

Grade: 4-a Lesson: S1-L7

Explanation: The best way to understand geometry is by looking at some examples. Take turns and read each example for easy understanding.

Examples:

If the perimeter of an equilateral triangle is 96 cm, then find the length of each side.

Step 1a

The perimeter of an equilateral triangle is calculated using the formula P = 3a, (a is length of each side) given that the perimeter of the triangle is 96 cm.

$1a$

Explanation:

Perimeter of an equilateral triangle = 3a, where 'a' is the length of each side. If the perimeter is 96 cm.

Step 1b

Now, we have to find length of the side by using the formula : 96 = 3a

Explanation: Using the formula 96 = 3a, we can find the length of the side.

Step 1c

Divide 3 on both sides

⇒ \$96/3\$ = \$(3a)/3\$

⇒ 32 = a

Explanation: Divide 3 on both sides : \$96/3\$ = \$(3a)/3\$

Step 1d

The length of each side in an equilateral triangle is 32 cm.

Explanation: Each side of the equilateral triangle measures 32 cm.