Rectangular / right prism	SA = ph + 2B · V = Bh = lwh
Cylinder	SA = 2πrh + 2πr² · V = πr²h
Pyramid	SA = ½ps + B · V = ⅓Bh
Cone	SA = πrs + πr² · V = ⅓πr²h
Sphere	SA = 4πr² · V = ⁴⁄₃πr³
	p = perimeter of base with area B; π ≈ 3.14

Slope of a line	m = (y₂ − y₁) / (x₂ − x₁)
Slope-intercept form	y = mx + b
Point-slope form	y − y₁ = m(x − x₁)
Standard form of a quadratic	y = ax² + bx + c
Quadratic formula	x = (−b ± √(b² − 4ac)) / 2a
Pythagorean theorem	a² + b² = c²
Simple interest	I = prt (I = interest, p = principal, r = rate, t = time)
Distance formula	d = rt
Total cost	total cost = (number of units) × (price per unit)