Name of Shape  Shape  Formula 
Square  Perimeter = 4 x s Area = s x s 

Rectangle  Perimeter = 2l + 2w Area = l x w 

Parallelogram  Perimeter = 2l + 2b Area = base x height 

Rhombus  Perimeter 4 x a Area = (d1 x d2)/2 

Triangle  Perimeter = a + b + c Area = (b x h)/2 

Equilateral Triangle  Perimeter = 3 x a Area = (√3 a ^{2} ) / 4 

Trapezoid  Perimeter = sum of all sides Area = (a + b) x h / 2 

Circle  Circumference = 2 x π x r Area = π x r ^{ 2 } 

Semicircle  Circumference = π x r x D Area = (π r ^{ 2 })/2 