kungfu math p3 slide13 (perimeter)pdf
DESCRIPTION
TRANSCRIPT
• calculation of the perimeter of
∗ rectilinear figure
∗ rectangle
∗ square
What will we learn today?
Measurement Perimeter
What is Perimeter?
The perimeter is the total distance around the
outside of a 2D shape.
Perimeter of Simple Shapes
There are special formulas for certain shapes:
For example:
What is the perimeter of this rectangle?
5cm
3cm
Let’s recall some concepts. Length is the longest dimension of an object.
Breadth is the extent or measure of how broad or wide something is.
5cm
3cm
Length
Breadth
Perimeter of Simple Shapes
There are special formulas for certain shapes:
For example:
What is the perimeter of this rectangle?
Perimeter = Length + Length + Breadth + Breadth
5cm
3cm 3cm
5cm
Try this out!
What is the perimeter of the square?
Try this out!
What is the perimeter of this square?
Let’s recall the formula:
Perimeter = Length + Length + Breadth + Breadth
Try this out!
What is the perimeter of this square?
A square has 4 equal sides.
Therefore,
Perimeter = Length + Length + Length + Length
= 4 x Length
Try this out!
What is the perimeter of the rectangle?
4 cm
10 cm
Try this out!
What is the perimeter of the rectangle?
Let’s recall the formula:
Perimeter = Length + Length + Breadth + Breadth
4 cm
10 cm
Try this out!
What is the perimeter of the rectangle?
Let’s recall the formula:
Perimeter = Length + Length + Breadth + Breadth
4 cm
10 cm
4 cm
10 cm
Try this out!
What is the perimeter of the rectangle?
Let’s recall the formula:
Perimeter = 10 + 10 + 4 + 4
= 28 cm
4 cm
10 cm
4 cm
10 cm
Summary
You can only find perimeter when the lengths and breadths have the same units.
For example,
the length is 5 cm and the breadth is 4 cm.
The perimeter will be 18 cm.
Summary
You can only find perimeter when the length and breadth have the same units.
For example,
the length is 5 m and the breadth is 4 m.
The area will be 18m.
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