Mathematics
Grade-7
Easy

Question

Tony made cookies of circumference 45 cm. _____ is the radius of the cookie.

  1. 4.56
  2. 6.98
  3. 7.15
  4. 8.02

hintHint:

the circumference of the circle = 2 cross times straight pi cross times radius space of space the space circle

The correct answer is: 7.15


    straight C equals 2 pi straight r comma
2 pi straight r equals 45 comma
2 cross times 22 over 7 cross times straight r equals 45 comma
straight r equals 45 cross times 7 over 22 cross times 1 over 2 to the power of apostrophe comma
straight r equals 7.15 space cm

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