please answer both........ it's urgent
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the length of ab is 10.5
Area of big circle = 154 cm 2
Area of circle = π r 2
therefore , π r 2 = 154
22 / 7 r 2 = 154
r 2 = 49
therefore , r = 7
The radius of big circle is 7 units
Radius of big circle + radius of small circle = 10. 5
7 + radius of small circle = 10.5
therefore , radius of small circle is 3.5
Area of small circle = π r 2
Area of small circle = 22/7 ( 3.5) 2 ( this 2 is square )
Therefore area of = 38. 5 cm 2
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