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# Areas, Perimeters and Circumferences of Shapes

Summary table of formulas of the areas, the perimeters and the circumferences of shapes. Tables contains links to web sites where are details how to calculate them, how to use formulas and the calculator for each shape.

## Areas of Shapes

Topic NameFormula
Area of SquareA = a × a
Area of RectangleA = a × b
Area of RhombusA = a × h
Area of RhomboidA = a × h
Area of TrapezoidA = 1/2 × (a + c) × h
Area of CircleA = (π × d2) / 4 = π × r2
Area of EllipseA = π × a × b
Area of TriangleA = 1/2 × a × h
Area of Parallelogramsby the type

## Perimeters and Circumferences of Shapes

Topic NameFormula
Perimeter of SquareC = 4 × a
Perimeter of RectangleC = 2 × (a + b)
Perimeter of RhombusC = 4 × a
Perimeter of RhomboidC = 2 × (a + b)
Perimeter of TrapezoidC = a + b + c + d
Circumference of CircleC = π × d = 2 × π × r
Circumference of EllipseC ≈ π × √2 × (a2 + b2)
Perimeter of TriangleC = a + b + c
Perimeter of Parallelogramsby the type