A quadrilateral is a polygon with four sides. There are two types of quadrilaterals: concave quadrilaterals which have at least one interior angle greater than 180 degrees, and convex quadrilaterals which have all interior angles less than 180 degrees. Common types of quadrilaterals include squares, rectangles, rhombi, parallelograms, and kites.

2. QUADRILATERALS
• A quadrilateral is a polygon with four sides.
• The origin of the word "quadrilateral" is the
two Latin words quadri, a variant of four, and
latus, meaning "side".
• Simple quadrilaterals are either convex or
concave.
• The interior angles of a simple quadrilateral
ABCD add up to 360 degrees that is
A + B + C + D = 360 degrees.

3. CONCAVE QUDRILATERALS
• CONCAVE QUDRILATERALS ARE THE
QUDRILATERALS WHICH HAVE ATLEAST ONE
ANGLE ABOVE THAN 180 DEGREE.

4. CONVEX POLYGON
• CONVEX QUADRILATERALS ARE THE
QUADRILATERALS WICH HAVE ALL THE
ANGLES BELOW 180 DEGREE.

5. TYPES OF
QUDRILATERALS
SQUARE
RECTANGLE
RHOMBUS
PARALLELOGRAM
KITE

6. SQUARE
• A QUAD WITH ALL
EQUAL SIDE.
• ALL ANGLES ARE
90 DEGREE.
• ALL SIDES ARE EQUAL
AND PARALLEL.
• DIAGONALS ARE EQUAL
AND PERPENDICILAR.

7. RECTANGLE
• OPPOSITE SIDES ARE
EQUAL AND PARALLEL.
• EACH ANGLE IS A RIGHT
ANGLE.
• DIAGONALS ARE EQUAL.

8. RHOMBUS
• OPPOSITE SIDESE ARE
EQUAL AND PARALLEL.
• ALL ANGLES ARE EQUAL.
• DIAGONALS ARE EQUAL
AND PERPENDICULAR.

9. PARALLELOGRAM
• OPPOSITE SIDES ARE
EQUAL AND PARALLEL.
• OPPOSITE ANGLES
ARE EQUAL.
• DIAGONALS BISECT
EACH OTHER AND
ARE UNEQUAL.
• SUM OF ADDJECENT
ANGLES IS 180 DEGREE.

10. KITE
• ADJECENT SIDES
ARE EQUAL.
• DIAGONALS ARE
PERPENDICULAR
AND BISECT EACH
OTHER.
• ONE PAIR OFOPPOSITE
SIDES IS EQUAL AND
ANOTHER IS UNEQUAL.