Useful for Kerala state syllabus 8th standard students

1. welcome

2. E CONTENT TOPIC :
AREA OF
QUADRILATERALS
Prepared by ,
Gayathry L R
3rd semester B.Ed
Dept of mathematics
GCTE Thycaud ,TVM
Kerala

3. SOUARE • All sides are equal
• Opposite sides parallel
• All angles are 90 degree
• Diagonals are equal
• Diagonals are perpendicular
bisectors of each other
AREA OF SQUARE = 𝑎2 , where ‘a’ is the side
AREA OF SQUARE = 𝑑2/2 , where ‘d’ is a diagonal

4. RECTANGLE
• Opposite sides are equal and parallel
• All angles are 90 degree
• Diagonals are equal and bisectors of each other
AREA OF RECTANGLE = lxb , where l=length , b=breadth

5. PARALLELOGRAM
h
• Opposite sides are equal and parallel
• Opposite angles are equal
• Adjacent angles are supplementary
• Diagonals bisect each other
AREA OF PARALLELOGRAM = bxh , where b=base h=height
b

6. RHOMBUS
• All sides are equal
• Opposite sides are parallel
• Opposite angles are equal
• Adjacent angles are supplementary
• Diagonals are perpendicular bisectors of
each other
AREA OF RHOMBUS = (d1xd2) /2 ,where d1 and d2 are diagonals

7. TRAPEZIUM
• One pair of opposite sides are parallel
• Sum of adjacent angles on nonparallel
sides is 180 degree
AREA OF TRAPEZIUM = (1/2)x h x(b1 + b2), where h is the
height and b1 and b2 are length of parallel sides
b1
b2

8. THANK YOU