Keglestub

\( O_A = \pi \cdot s \cdot \left( r + R \right) \)

\( A = \pi \cdot \left( R^2 + s \cdot \left( r + R \right) + r^2 \right) \)

\( V = \frac{1}{3} \cdot \pi \cdot h \cdot \left( r^2 + R^2 + r \cdot R \right) \)

Keglestub - udfoldet

\( k = 2 \cdot s_2 \cdot \sin \left( \frac{v}{2} \right) \)

\( v = 360^\circ \cdot \frac{R}{s_2} \)

\( s_2 = \text{Keglens sidelngde} \)

\( v = udsnitsvinklen \)

\( R = \text{Se keglestub ovenfor} \)