Rectangle

b

a

Perimeter = 2 (a+b)

Area = a x b;

Where a = length b = breadth

Square

a

a

Perimeter = 4 x side = 4a

Area = (side) =

Where a = side

Parallelogram b

h aa

b

Perimeter = 2 (a+b)

Area = b x h

Where a = breadth b = base ( or length) h = altitude

Rhombus

a

d1

d2

Perimeter = 4a

Area = 1/2 x d1 x d2

Where a = side &D1 and D2 are diagonals

Irregular quadrilateral

p qh1

d

h2

s r

Perimeter = p + q + r + s

Area = 1/2 x d x (h1 + h2)

Trapezium

h

a

m n

b

Perimeter = a + b + m + n

Area = 1/2 (a+b)h

Where a and b are two parallel sides;

m and n are two non parallel sides;

h = perpendicular distance between two parallel sides

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