Classify quadrilaterals :
A closed geometric figure with four sides and four vertices is called a quadrilateral. The sum of all the four angles of a quadrilateral is 360°.
A quadrilateral can be classified as follows.
A square is a regular quadrilateral, which means that it has four equal sides and four equal angles. It can also be defined as a rectangle in which two adjacent sides have equal length. A square with vertices ABCD would be denoted ABCD.
Area of a square = a²
Perimeter of a square = 4 a
Here "a" stands for side length of the square.
A rectangle is a quadrilateral with four right angles. It can also be defined as an equiangular quadrilateral, since equiangular means that all of its angles are equal.
Area of the rectangle = length x width
Perimeter of the rectangle = 2(length + width)
A quadrilateral in which the opposite sides are parallel is called a parallelogram.
Area of parallelogram = base x height (or)
Area of parallelogram = diagonal 1 x diagonals 2
Perimeter of parallelogram = Sum of length of all sides
A rhombus is a simple quadrilateral whose four sides all have the same length.
Area of rhombus = (1/2)(diagonal 1 x diagonals 2)
Perimeter of rhombus = Sum of length of all sides
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