CBSE · Class 6-12

Back to Math of Space: Surface Area and Volume

Class 9 · Ganita Manjari · Unit 14: Math of Space: Surface Area and Volume

Slant Height of a Cone

Lesson 3 of 3

The slant

\ell

is the straight-line distance from the tip to a point on the base circumference. Pythagoras on the triangle formed by radius, height and slant:

\ell^2 = r^2 + h^2

.

Why the $\tfrac{1}{3}$ in the Cone Volume

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