# Useful Formulae

6 THREEDIMENSIONALFIGURES volumes and surface areas Formul for the volumes and surface areas including bases of eight threedimensional solids are given below. Sphere Volume r3 Surface area 4r2 Box Volume abc Surface area 2ab ac bc Cylinder Volume r2h Surface area 2rh 2r2 Cone Volume r2h Surface area r r2 h2 r2 Pyramid Base area A Volume Ah Frustum Volume h a2 ab b2 Surface area a bc a2 b2 Ellipsoid Volume abc Torus Volume 2a bb a2 Surface area 2b2 a2 7