Kungfu math p4 slide19 (perimeter)
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Transcript of Kungfu math p4 slide19 (perimeter)
• calculation of the perimeter of ∗ rectilinear figure ∗ rectangle ∗ square
What will we learn today?
MeasurementPerimeter
What is Perimeter?
The perimeter is the total distance around the outside of a 2D
shape.
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
3cm3cm
5cm
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.
A and B have the same area. Find the unknown length, x.
AB
64cm²x cm
A and B have the same area. Find the unknown length, x.
___ x ___ = 64cm²
AB
64cm²x cm
A and B have the same area. Find the unknown length, x.
8 x 8 = 64Therefore, x = 8cm
AB
64cm²x cm
2 similar rectangles overlapped each other.Find the perimeter of the figure.
4 cm
6 cm
8 cm
4 cm
2 similar rectangles overlapped each other.Find the perimeter of the figure.
4 cm
6 cm
8 cm
4 cm
The length and breadth have the same value.
2 similar rectangles overlapped each other.Find the perimeter of the figure.
4 cm
6 cm
8 cm
4 cm
6 + 8 + 4 + 6 + 8 + 4 = ______ cm
6 cm8 cm
2 similar rectangles overlapped each other.Find the perimeter of the figure.
4 cm
6 cm
8 cm
4 cm
6 + 8 + 4 + 6 + 8 + 4 = 36 cm
6 cm8 cm
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