Find the area of a circular ring whose external and internal diameters are 20 cm and 6cm respectively.
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Answer:285.74
Step-by-step explanation:
Here, D=20, d=6,
Area of the ring=(area of outer circle)-(area of inner circle)
Area of the ring
={π×(D/2)^2}-{π×(d/2)^2}
={3.14×(20/2)^2}-{3.14×(6/2)^2}
={3.14×100}-{3.14×9}
=3.14×91
=285.74
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