1. MD Saifur Rahman Lecturer (Mathematics) RAJUK Uttara Model College

2. Welcome To Math Class

3. Class NINE Subject: Higher math Chapter : Solid Geometry [7.2 ]

5. Cylinder

7. Cone

8. Today’s topic is Cylinder & Cone

9. Learning Outcomes Students will be able to Measure the surface area of a cylinder and a cone Find out the volume of a cylinder and a cone Identify the shape of the surface of a cylinder and a cone

10. Identify Cone and Cylinder shapes in the following Rocket Glass TentWater Tank

11. How many surfaces are there ? How many parts are there to color in this candle ?

12. r2r2 r2r2 2r2r h 2  rh Surface Area

13. h Radius, r Volume = Area of base × height

14. The length and the breadth of a book is 10 cm and 3 cm. When it revolves around the greatest side then find the surface area and volume of that solid. 10 cm 3 cm Problem : 1 ( Pair work)

15. Greatest side Rectangle Cylinder

16. Height, h Radius, r Slant length, l Circumference, 2 πr Slant length, l Surface Area r2r2  rl

17. Volume http://www.youtube.com/watch?v=WCqrWM261r0 Click the link below to watch a video clip

18. Two sides of a right angle triangle are 5 cm and 3.5 cm. If the triangle revolves around its longest side then find the surface area and volume of the solid shape formed. 5 cm 3.5cm Problem : 2 (Individual Work)

19. Right angle triangle Cone

20. Group Work The height of a cone-shaped tent is 7.5 m. How much canvas is needed to cover 2000 square metres of land? Students will divide into 8 groups Every group has to solve the following problem

21. Home Work Every student should create a problem related to a Cone or Cylinder & bring it to the next class so other students can try to solve it.

22. http://www.youtube.com/watch?v=WCqrW M261r0 www.google.com Acknowledgement

23. Thanks All To