1-It decrease the rate of increase of pressure and reduces energy losses.
2-Otherwise there may form eddy current due to separation of wall.
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The curved surface area of a cone is: pi*radius*slant length.
You cannot.
The height of?æ a cone is found by use of Pythagoras theorem. Pythagoras theorem states that the sum of the squares of two shorter sides (in this case, the shorter sides are?æ the height and radius of the cone) are equal to?æ the square of the longer side (for this case the longer side is the length of the cone).
The shape described cannot be a cone since a cone has a base at one end and a point - of zero length - at the other!
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