find the area of the sector ofa circle of radius 12cm and angle at the centre 30°
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The sector is a fraction of a circle
Here the fraction is 42/360
No need to worry about reducing the fraction, use your calculator
The area of a circle is pi×r^2
= pi×12×12
Multiply your answer by42/360
=52.779cm^2
53cm^2 to nearest cm
If you take pi=22/7 then you get
(22×12×12×42)÷(360×7)
22×12×12×6 ÷360
22×12×12 ÷60
22×12 ÷5
264÷5
52.8cm^2
I hope this helps you
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