Understanding Perimeter
Storyboard Text
- What is Perimeter Ritu Ma'am?
- PERIMETER
- So students today we are going to study Perimeter
- But how can we measure the perimeter of a shape?
- PERIMETER
- Perimeter means the measure of the boundary of a particular shape.
- Oh ok Ma'am! Let's see
- PERIMETER
- We can find the perimeter of a shape by measuring its boundary. Let's see how -
- 10 cm
- 10 cm
- Ok Ritu Ma'am now I am able to understand Perimeter, but what about a rectangle is it the same process as a square?
- PERIMETER
- So for example if we take this square with side 15 cm, we will add 15 four times because we already know that a square has all 4 sides equal so we will do 15+15+15+15 = 60 or 15 x 4 = 60 cm.
- Ok Mark, let's see for a rectangle.
- Oh ok Ma'am! So it is a totally different way for a Rectangle!
- PERIMETER
- Yes Mark, You're Right!
- 20 cm
- 5 cm
- Now, for example if we take this rectangle with length 20 cm and breadth 5 cm so the Perimeter will be 20+5+20+5 = 50 cm or 2 (length+breadth) which is 2x20+5 which is 2x25 = 50 cm
- The length of this rectangular board is 40 cm and the breadth is 20 cm so the Perimeter will be 40+20+40+20 = 120 cm or 2 (length+breadth) which is 2x40+20 which is 2x60 = 120 cm.
- PERIMETER
- Wow Mark, you're a quick learner! Amazing!
- 40 cm
- So Mark can you tell me the Perimeter of this board?
- 20 cm
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