Maths slides
- 1. 1. Yang Jing Loo 0323066 2. Soo Yon Li 0322821 3. Goh Song Kit 0322013 4. Cherilyn Chia 0321986 5. Chan Yi Fung 0323057 6. Lim Hong Wei 0322741
- 2. - It has 2 circular faces (top & bottom) - It has one curved side - It is not a polyhedron as it has a curved surface
- 3. Surface Area = 2πr(r+h) Which is made up of: Surface area of circular base = πr² Surface area of curved surface = 2πr x h
- 4. Surface Area = 2πr(r+h) = 2π(2)(2+7) = 2π(2)(9) = 36π ≈ 113.097 If the height(h) is 2, and the radius(r) is 7, find the surface area of the cylinder.
- 5. Volume = πr²h Just multiply the area of the base by the height of the cylinder: - Area of the base: πr² - Height: h - Volume = Area × Height = πr² x h
- 6. How to remember: Volume = pizza Imagine that you just made a pizza, z = radius, a = height, find the volume of the pizza.
- 7. Volume = πr² x h Volume = 22/7(2²)(6) = 75.429cm³ Given that the radius is 2 and a height is 6, find the volume.
- 8. Volume= πr² x h Volume =22/7(3²)(5) =141.428cm³ What is the volume of the cylinder with a radius of 3 and a height of 5?
- 9. What is a circle? •A circle is a type of line. •The distance between any points and the centre is called the radius. •Diameter of a circle is any straight line that passes through the center of the circle and whose endpoints lie on the circle.
- 10. π = 22/7 or 3.142 r = is the radius of the circle
- 11. 1. Calculate the area of the circle when the radius of the circle is 7cm 2. Calculate the radius when the area of the circle is 113.10cm
- 12. 1. π x 7² = 153.94cm² 2. πr² = 113.10cm² r² = 113.10/π r² = 36 r = √36 r = 6cm
- 14. Find the area of sector AOB. Solution: Area AOB= ½ x 450² x 2π/3 rad. = 212057.5 m²
- 16. Find the area of sector AOB Solution: AOB in radian =(∏/180) x 120 = 2.094 rad. Area AOB = ½ x 4² x 2.094 = 16.755cm²