sqrt( (R-r)^2 + h^2)
where:
R = radius of larger end
r = radius of smaller end
h = height of truncated cone
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False. The surface area formula for a right cone is not the same as the surface area formula for an oblique cone.
For a circular cone: sqrt( (R-r)^2 + h^2) where: R = radius of larger end r = radius of smaller end h = height of truncated cone For cones of other shapes the average of the area of the top and bottom surfaces times the height (perpendicular to the plane of the top/bottom)
Mathematically, a cone is infinite and so has no flat surface. The popular cone is actually a truncated cone and does have 1 flat surface.
True. This is because the slant height of an oblique cone cannot be defined.
V = (1/3*Pi*h) * (R12 + R22 + R1*R2) Where R1 and R2 are the radii of the bases, and h is equal to the height of the truncated cone.