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# Perimeter and Area

### Formulae for perimeter and area of 2D shapes

Rectangle Perimeter 2L + 2B
Rectangle Area lb
Triangle Area 1/2 bh or bh/2
Circle Circumference πD or 2πr
Circle Area πr²
Arc length Length θ/360 x πD
Arc length Perimeter θ/360 x πD + 2r
Arc length Area θ/360 x πr²
Square Perimeter 4S
Square Area
Trapezium Area 1/2h(a+b)
Rhombus Perimeter 4S
Rhombus Area 1/2xy (x and y being diagonals) or xy/2
Parallelogram Perimeter 2l + 2b (where l and b represent the parallel sides)
Parallelogram Area bh (where b represents the set of parallel sides perpendicular to the height)
Quadrilateral There is no formula. The area is found by joining opposite corners to form two triangles. The sum of the areas of the two triangles gives the area of the quadrilateral.
Created by: turfewisawesome