Geometry Reference
Formulas for Area of Polygons
l = length w = width s = side h = height b = base
a = apothem P = perimeter r = radius
d = diagonal
- RECTANGLE -l*w
- SQUARE - s*s
-
TRIANGLE - 1/2 * (b*h)
- CIRCLE - (pi) * r * r
- PARALLELOGRAM - b * h
- RHOMBUS - 1/2 * (d * d)
- TRAPEZOID - 1/2 * h(b+b)
- ANY OTHER REGULAR POLYGON - 1/2 * P * A
Formulas for Surface Area of Polyhedrons
B = area of base e = edge P = perimeter of base
- CUBE - B * 6
- RECTANGULAR PRISM - Ph + 2B
- RIGHT CYLINDER - 2(pi)rh + 2(pi)r*r
- REGULAR PYRAMID - 1/2 * P * l + B
- RIGHT CONE - (pi) * r * l + (pi) * r * r
- SPHERE - 4 * (pi) * r * r
Formulas for Volume of Polyhedrons
- CUBE - e * e * e
- RECTANGULAR PRISM - Bh
- RIGHT CYLINDER - (pi) * r * r* h
- RIGHT CIRCULAR CONE - 1/3 * Bh
- RIGHT PYRAMID - 1/3 * Bh
- SPHERE - 4/3 * (pi) * r * r * r
Formulas for Graphed Lines
SQ = squared SQR = square root
- SLOPE - (Y2 - Y1) / (X2 - X1)
- DISTANCE - SQR((X1 - X2)SQ + (Y1 - Y2)SQ)
Back to Home Page