Area & Volume of 3D Shapes Key Formulas Rectangular Prism: V = lwh, SA = 2(lw + lh + wh) Cylinder: V = πr²h, SA = 2πr² + 2πrh Cone: V = ⅓πr²h Sphere: V = ⁴⁄₃πr³, SA = 4πr² Pyramid: V = ⅓Bh (B = area of base) ACT Tips Formulas are NOT given on the ACT — memorize them! Watch for composite shapes (cylinder + cone, etc.) Unit conversion in volume: cube the linear conversion factor