2. Form 1 Mathematics Area of plane shapes Chapter 16

3. Review Area of a rectangle Area of a rectangle = l x b E.g. 6 cm 4cm Area of this rectangle = 6cm x 4cm = 24cm 2

4. Review Area of a square Area of a square = s x s or s 2 E.g. 5 cm Area of this square = 5cm x 5cm = 25cm 2

5. Review Area of composite shapes We can find the area of a composite shape by breaking it up into rectangles and squares. E.g. This shape can be broken into two rectangles. 10 9 4 3

6. Review Area of composite shapes E.g. Can you find the dimensions of the rectangles? 10 6 3 4 Now can you find the area of each rectangle? What is the area of the composite shape? 60 cm 2 12cm 2 + 60 cm 2 12cm 2 = 72cm 2

7. Review Area of composite shapes Can you calculate the area of this shape? 8 5 3 5 This shape can be broken into two rectangles. A Big One and A small one

8. Review Area of composite shapes So, the area is equal to 8 5 40cm 2 subtract 3 5 15cm 2 =25cm 2

9. Area of a parallelogram To obtain the area of a parallelogram you need two lengths. The length of the base. base And the perpendicular height. Perpendicular height The area of a parallelogram = base x perpendicular height

10. Area of Parallelogram E.g. 6cm 4cm Area of parallelogram = 6cm x 4 cm = 24cm 2

11. Area of triangle Area of a triangle = ½ x base x perpendicular height Where … base Perpendicular height

12. Area of triangle E.g. Find the area of the triangle 5cm 8cm Area of triangle = ½ x 5 x 8 = 20cm 2

13. Home work  Review pg 135 Ex 16c #2, #3  Pg 137 Ex 16d #1 to 15  Pg 139 Ex 16e #1

14. Conclusion Thank you for being your usual wonderful selves!!!