You have studied many properties of a triangle in fundamental mathematics and you know that on joining three non-collinear points in pairs, the figure so obtained is a triangle. Now, let us mark four points and see what we get on joining them in pairs in a number of orders.
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A quadrilateral is a closed shape in a plane formed in four line segments.
That is, ∟A+ ∟B +∟C +∟D = 360°.
We have seen the quadrilateral and its parts. Now we shall see the special types of quadrilaterals.
Types of quadrilateral:
Let see the square quadrilateral square in the following section:
Ina quadrilateral if all the four sides are the same and if all the angles are right angle after that the quadrilateral is called a square.
Here the sides AC = BD and
the angles ∟A = ∟B = ∟C = ∟D = 90°.
Let us see some examples of square quadrilateral:
Find the area of square quadrilateral whose side is 3 cm.
We know that, Area = a2 sq.units
Here a = 3 cm
A = 3*3 = 9 cm2
Find the area of a square quadrilateral whose perimeter is 44 cm
Given Perimeter of the square, P = 44 cm
We know that P = 4a units
i.e 4a = P
A = p/4
Therefore, side of the square ,
a = 44/4 = 11
a = 11
Area, A = a2 sq.units
= 11 *11 =121
Therefore, Area = 121 m2