Name: Perimeter of a Closed Semicircular Figure
Uploaded: 2019-07-19
Duration: 2 min 24 s
Description: We know how to calculate the circumference or perimeter of a circle. Let’s watch how to calculate the perimeter of a closed semicircular figure in this video.

Question

Find the perimeter and area of the following figures, given the dimensions, are in $cm$ .

Accepted Answer

We are given to find the perimeter and area of the following figures. The dimensions are in $cm$ .

We know that the perimeter of a closed figure is the length of its boundary. It is obtained by adding the lengths of the sides of the figure.

Hence, the perimeter of the above figure $= 2 + 3 + 5 + 3 + 2 + 9 + 2 + 3 + 5 + 3 + 2 + 9 = 48 cm$ .

To compute the area, we shall divide the given figure into rectangles as shown below.

Here, $K D = J E = 9 - 3 - 3 = 3 cm$ .

So, the area of the given figure $=$ the area of the rectangle $A B C L +$ the area of the rectangle $D E J K +$ the area of the rectangle $F G H I$

$= 9 \times 2 + 5 \times 3 + 9 \times 2$ [The area of a rectangle $= length \times breadth$ ]

$= 18 + 15 + 18$

$= 51 {cm}^{2}$ .

Therefore, the perimeter and the area of the given figure are $48 cm$ and $51 {cm}^{2}$ , respectively.

Find the perimeter and area of the following figures, given the dimensions, are in $cm$ .

Important Questions on Perimeter and Area

Learn and Prepare for any exam you want !

Find the perimeter and area of the following figures, given the dimensions, are in cm.

Important Questions on Perimeter and Area

Learn and Prepare for any exam you want !

Find the perimeter and area of the following figures, given the dimensions, are in $cm$ .