Circumference of a circle = p · d
Area of a rectangle = l · w
Area of a parallelogram = b · h
Area of a trapezoid = 1/2 (b1 + b2) h
Area of a circle = p · r squared
Area of a triangle = 1/2 · b · h
Surface area of a sphere = 4 p · r squared
Volume of a sphere = 4/3 p · r cubed
Volume of a rectangular prism = l · w · h
Volume of a circular cylinder = p · r squared · h
Volume of a circular cone = 1/3 · B · h
Volume of a pyramid = 1/3 · B · h
Pythagorean Theorem: a squared + b squared = c squared
Symbols: "p " = pi "· " = multiplication
Letters: "d" = diameter, "r" = radius, "l" = length, "w"= width, "h" = height,
"b" = base, "B" = area of base, let "a,b,c" = sides of a right triangle