LEARN MATH STEP BY STEP THROUGH VERY EASY PROCESS

QUADRILATERAL

__QUADRILATERAL__

**A quadrilateral is a polygon with four sides. The quadrilateral ABCD shown in the
figure has :**

**Four sides
AB, BC, CD, and DA **

**Four Vertices A, B, C, and D**

**Four Angles
∠A
(or ∠DAB),
∠B (or ∠ABC),
∠C
(or ∠BCD)
and ∠D
(or ∠CDA)**

**Two
Diagonals AC & DB**

**Parallelogram –**

**A quadrilateral is called a parallelogram if its opposite
sides are parallel. In the figure, ABCD is a parallelogram, in which DC is
parallel to AB & DA is parallel to CB. A parallelogram has some special
properties which we learn** –