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Math

posted by on .

A waffle cone has a width of 7.6 cm and height of 15.2cm and a chocolate coating that is 2mm thick. What is the volume of the chocolate coating? How many of these cones if they were filled up to the brim would be needed for 400 gallons of ice cream given 2 gallons is 0.01m^3?

What i already know:
V of the cone without chocolate coating:229.84m^3
V of the cone with chocolate coating:258.03m^3
V of the chocolate coating:32.53m^3

PLEASE HELP ME - NOT ONLY AM I CONFUSED BUT I ALSO WANT TO HIT THE PROBLEM ALREADY.

Thanks to anyone who will help :)
XOXO, CJ

  • Math - ,

    it looks like you just added .2 cm to the height and .2 cm to (1/2) the width, then used the formula for volume of the cone.
    For all practical purposes, this will be ok.
    But, ...
    There is a rather complicated calcululation needed for the extensions at the vertex of the cone and the base of the cone
    Draw a cross-section of the cone with r= 3.8 and h = 15.2
    Now draw a larger cross-section around it so that the distance between the two triangles is .2 cm
    From the top of the original triangle draw a perpendicular to the new side and extend the height to meet the new triangle.
    The extension of the height will be hypotenuse of a small right-angled triangle, where you know one of the sides to be .2
    You will need the angle at the top.
    That angle will be equal to the angle formed by the original height and the side of the original cone.
    let that angle be Ø
    tanØ = 3.8/15.2 = ....
    you can find Ø

    now in the little triangle, let the hypotenuse be h
    sinØ = 0.2/h
    h = 0.2/sinØ

    Of course at the base we can just add 0.2 to the origianal height.
    So new height = 15.2 + h + 0.2

    you will have to do a similar calculation at the base of the cone.
    remember that the angle there will be 90-Ø

    Good luck.

    BTW, the answers you gave should have been in cm^3 , not m^3

    For you second part, you are only concerned with the volume of the original cone, the chocolate cover does not affect how much the cone can hold.

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