math

posted by .

The ratio of the radii of two circles is 2:3.
find the ratio of their circumferences and the ratio of their areas

  • math -

    Circumference is a linear measurement, so
    the ratio is still 2:3

    but...
    areas of circles are proportional to the square of their radii.
    so 2^2 : 3^2 = 4 : 9

  • math -

    4:9

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. geometry-finding ratio

    Ratio of the heights of two similar cones is 7/9 what is the ratio of their radii?
  2. math

    a circular plate has radius 15cm. every dimension is multiplied by 4 to create a larger, similar plate. how is the ratio of the circumferences related to the ratio of the corresponding dimesions?
  3. geometry

    if two cones are similar and the ratio between the lengths of the radii is 7:3, what is the ratio of their surface areas
  4. geometry

    if two cones are similar and the ratio between the lenghts of the radii is 7:3, what is the ratio of their surface areas
  5. math

    The ratio of the radii of two circles is 2:3. Find the ratio of their circumference and the ratio of their areas
  6. Math...again

    Two circles have circumferences of π and 3π. What is the ratio of the area of the circles?
  7. Math...anyone?

    Two circles have circumferences of π and 3π. What is the ratio of the area of the circles?
  8. math

    Radii of two circles are in the ratio of 2/3. Find the ratio of their circumferences
  9. Math.

    two concentric circle with the ratio of radii as 2:3, what is the ratio of the circumferences
  10. Maths

    If the ratio between the two circles is 9:16,find i)the ratio between the radii ii)the ratio between their circumference Thank you

More Similar Questions