1. Perimeter and Area

10. A Quiet
Look at
Area

11. How many blocks get covered?
How do we Measure Area?
How many blocks get covered?

12. Area of a Rectangle
Area =
Area = 8 × 4
= 32 units2

13. Area of a Rectangle n m
Area of rectangle = m × n

14. Area of a Parallelogram Area of parallelogram = b × h
height
base
Area of parallelogram = b × h
Note: height NOT side

15. Area of parallelogram = b × h
Area of a Triangle h b
Area of parallelogram = b × h
Area of triangle = ½ b × h

16. Area of a Triangle h b Area of parallelogram = b × h
Area of triangle = ½ b × h
Be careful – this is NOT part of the base.

17. Area of trapezium = ½ (m + n) × h Area of parallelogram = (m + n) × h
Area of a Trapezium n h m n
Area of trapezium = ½ (m + n) × h
Area of parallelogram = (m + n) × h

18. Area of kite = (diagonal 1) × ½ (diagonal 2)
Area of a Kite
½d2 d2 d1 d1 d1
Area of kite = (diagonal 1) × ½ (diagonal 2)
= ½ d1 × d2

19. Area of a Square ½ d iagonal Area of square = ½ d × ½ d + ½ d × ½ d

20. Area of a Rhombus 2 × Area of rhombus = d1 × d2

21. The resulting rectangle has a perimeter of 26 units.
One side of a square is increased by 3 units while the adjacent side is decreased by 2 units.
The resulting rectangle has a perimeter of 26 units.
What is the area of the square?

22. Decide why each could be the odd one out.