SaiBook.us Geometry

Example

Title: Perimeter of Rectangle

Grade: 4-a Lesson: S1-L4

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

Examples:

The rectangle has a width of 8 meters and a perimeter of 64 meters. What is the length?

Step 1a

Given that the Perimeter(p) is 64 mtrs

width(w) is 8 mtrs

The formula for the perimeter of a rectangle is: Perimeter (P) = 2 × (Length(l) + Width(w))

$1a$

Explanation: The perimeter of the given rectangle is 64 meters, and the width is 8 meters.

Step 1b

We now need to determine the length of l by using formula

64 = 2(l + 8)

⇒ 64 = 2l + 16

⇒ 64 - 16 = 2l

⇒ 48 = 2l

Explanation: We need to determine the length of l by solving the equation 64 = 2(l + 8). After simplification, we get 48 = 2l.

Step 1c

Now divide "2" on both sides

\$48/2 = (2l)/2\$

⇒ l = 24

So, the length of the rectangle is 24 meters.

Explanation: After doing the calculation, it was determined that the length of the rectangle is 24 meters.