Two circles have a common centre and different radii. The radius of the bigger
circle is 15m and the radius of the smaller circle 7m. Find the area of the portion
between the circles. ( = 3.14
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82
Let the bigger radius be R m and the smaller radius be r m.
Therefore,the area of the portion between the two circles=π(R²-r²)
=π{(20)²-(10)²}
=π(20+10)(20-10)
=π×30×10
=3.14×300
= 942 m²
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