What is area of a rectangle, Parallelogram, Square and triangle

Area of Parallelogram = Base times Height

a parallelogram is a simple quadrilateral with two pairs of parallel sides

A quadrilateral is a four-sided polygon, having four edges and four corner

Area of Rectangle = Length times Width

A rectangle is a quadrilateral with four right angles

Area of Triangle = 1/2 times (base) times (height)

A triangle is a polygon with three edges and three vertices

Area of Square = Length times Length

a square is a regular quadrilateral, it has four equal sides and four equal angles