aatiq16 aatiq16
  • 24-02-2018
  • Mathematics
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the ratio of the circumferences of two circles 2 : 5. Find the ratio of their areas

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nihisera nihisera
  • 24-02-2018
Circumference one = (2R)*pi let that value be 2x
C second = 5x = (2R)*pi * 5 / 2 = (5R)*pi
So Radius one / Radius two = 2 / 5
Area1:Area2=pi(2R)^2:pi(5R)^2=pi(4R^2):pi(25R^2), pi cancel out we get
4R^2:25R^2, now R^2 cancel out and we get ratio of
4:25
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