10. Find the area of a quadrant of a circle whose circumferer
11. The sum of circumference and radius of a circle is 51cm. find its area.
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Explanation:
Sum of circumference and radius = 51 cm.
Find radius = (?)
→ circumference + radius = 51
∴2πr+r=51
∴r(2π+1)=51
∴r=
2π+1
51
=
2×
7
22
+1
51
=
7
44+7
51
=
51
51×7
∴r=7cm
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