Distance along the surface from the apex to the base edge midpoint.
Vertical height (h)12
Base dimension5
Unitcm
Vertical height (h)12
Slant height (l)13
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Slant height is 13.0000 cm.
The slant height is 1.083 times the vertical height. A ratio close to 1 means the shape is tall and narrow; a large ratio means it is wide and flat.
Lateral (curved) surface area: pi * r * l = 204.20 cm².
Total surface area (including base): 282.74 cm².
The slant height is always the hypotenuse of a right triangle whose legs are the vertical height and the apothem (half-base for a pyramid, radius for a cone).
Next stepUse the slant height in the lateral surface area formula A = pi*r*l, or find the cone volume with V = (1/3)*pi*r²*h.