Width: b

High: h

Circumference: c

The circumference of a rectangle = (length+width) ×2

Formula: C=(a+b)×2

Circumference of a square = side length ×4

Formula: C=4a

Area of rectangle = length × width

Formula: S=ab

Area of a square = side length × side length

Formula: s = a a = a?

Area of triangle = base × height ÷2

Formula: S=ah÷2

Area of parallelogram = base × height

Formula: S=ah

Trapezoidal area = (upper bottom+lower bottom) × height ÷2

Formula: s = (a+b) h ÷ 2