1.

Find the circumference of circle and area of circle whose radius is 7 cm.​

Answer»
  • FACT: circumference of a circle whose radius is r is GIVEN by 2πr

Here r=7 cm

HENCE circumference of the circle =2π(7)=2⋅22/7.7=2.22=44cm

  • AREA of a circle =πr
  • 2
  • , where r is the radius of the circle
  • Since r=7
  • So, area of the given circle =π×7×7=49π


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