All Leaving Cert Mathematics posts
  • avatar image

    Volume of a cone dee.murnane

    There are two cones of equal height with a radius of ratio 1:2. Calculate the volume of the cones?

    Answer is 1:4 but why?

    1. avatar image

      ow9654

      Formula for (v) volume of a cone is 1/3(pi)r^2h

      The radius of cone one is 1r and the radius of cone two is 2r.

      So sub in r and 2r on each side of the equals. Once that's done its just algebra, get rid of what's common.

      I attached a file doing the math on paint.

      attachment Doc1.docx

    2. avatar image

      dee.murnane

      Thanks a million

    3. avatar image

      Me

      Share files from your computer
      loader