-the space a shape takes up
-described in square units eg. 4cm²
Area of square or rectangle
=6x2
=12cm²
Parallelogram
Base x Height
eg. the base 10cm and the heght is 5 cm
A=bxh
A=10x5
A=10x5
A= 50 cm²
Finding the Area of a circle
Use pieces of circle to create a shape very close to a parallelogram.
Close to parallelogram
H=Radius
B=½ circumference
Ap=bxh
Ao=2 pi r ÷2 x r
Ao=pi xrxr
The simple formula is Ao=pi r²
The simple formula is Ao=pi r²
*Sorry the pi symbol doesn't work.
Find the Area of a circle with the radius of 10m.Show formula and work.
Ao=pi r²
Ao=3.14xrxr
Ao=3.14x100
=314m²
Find the Area of the following circles
the first circle has the radius of 8cm
the 2nd circle has the radius of 14.8m
Ao=pi r²
Ao=3.14x8x8
Ao=3.14x64
=200.96cm²
Ao=3.14x8x8
Ao=3.14x64
=200.96cm²
Ao= pi r²
=3.14x14.8x14.8
=3.14x219.04
=3.14x219.04
=687.79m²
To find the Area of a circle,and the question gives you the diameter.
You should divide it into 2.After you find the quotient use formula to answer the question.
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