Area Learning Outcomes I can find the area of the following 2D shapes. Rectangle Triangle ...
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Transcript of Area Learning Outcomes I can find the area of the following 2D shapes. Rectangle Triangle ...
Area
Learning OutcomesI can find the area of the following 2D shapes. Rectangle TriangleTrapeziumCircle
S3 BLOCK 8 Area and volume
Area
Area is the size of a surface.
It is the amount of space inside the boundary of a 2D shape.
The Area of Rectangle
For a rectangle,
Area = length x breadth
length
breadth
The Area of a Circle
For a circle,
Note: is
is the radiusRadius, the distance from the centre of the circle to the outside edge.
𝑟
The Area of a Triangle
For a triangle,
Note: is the perpendicular height is the base
h
𝑏
The Area of a Trapezium
𝐴𝑟𝑒𝑎=12h(𝑎+𝑏)
h
a
bFor a trapezium,
Note: is the perpendicular height
Example 1: Calculate the area
Height is 7 cmBase is 6 cm
Example 2: Calculate the area
Example 2: Calculate the area
h=5 𝑎=8 b=4
𝐴=12×5(8+4)
𝐴=0 ∙5×5×12
𝐴=30𝑐𝑚2
Example 3: Calculate the area
Example 3: Calculate the area
Area of square
A = 64
Area of semi circle
The diameter is 8 mThe radius is 4 m
Total = 89·12