SaiBook.us Geometry

Example

Title: Perimeter of Square

Grade: 4-a Lesson: S1-L3

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

Examples:

You have a square garden with sides measuring 6 feet. What is its perimeter?

Step 1a

Given each side(s) of the square is 6 feet long.

The formula for the perimeter of a square is P = 4s

⇒ \$4 \times 6\$ = 24 ft

So, the perimeter of the square garden is 24 feet.

$1a$

Explanation: Each side of the square is 6 feet in length.

The formula for this is P = 4s.

The square garden has a perimeter of 24 feet.

Step 1b

The perimeter of a square of sides is 40 cm. Find each side.

Explanation: Given that the perimeter(p) is 40 cm.

Step 1c

Now, we have to find the length of each side (s).

You can rearrange the formula to solve for "s":

⇒ s = \$p/4\$

⇒ s = \$40/4\$

= 10.

Explanation: We need to find the length of each side (s).

The formula can be rearranged to solve for "s" : s = \$p/4\$.

For example, if p = 40, then s = 10.

Step 1d

Each side of a square is 10 cm.

Explanation: The length of each side of a square is 10 cm.