Find the radius and the area of a circle if it's circumference is 18×22÷7 cm.
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Circumference = 18 × 22 / 7
=> 2 × pi × R = 18 × 22 /7
=> 2 × 22 /7 × R = 18 × 22 /7
=> 2R = 18
=> R = 9
Radius of circle = 9 cm
Area = pi r^2
= 22 /7 × 9^2
= 22 × 81 /7
= 1782 /7
= 254.57 cm^2
=> 2 × pi × R = 18 × 22 /7
=> 2 × 22 /7 × R = 18 × 22 /7
=> 2R = 18
=> R = 9
Radius of circle = 9 cm
Area = pi r^2
= 22 /7 × 9^2
= 22 × 81 /7
= 1782 /7
= 254.57 cm^2
gopal5426:
Thanks
Answered by
3
Circumference = 18 × 22 / 7
=> 2 × pi × R = 18 × 22 /7
=> 2 × 22 /7 × R = 18 × 22 /7
=> 2R = 18
=> R = 9
Radius of circle = 9 cm
Area = pi r^2
= 22 /7 × 9^2
= 22 × 81 /7
= 1782 /7
= 254.57 cm^2
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