logging in or signing up Y8MA3G_Surface area of cubes and cuboids_19_01_2012 Miss_Karampela Download Post to : URL : Related Presentations : Share Add to Flag Embed Email Send to Blogs and Networks Add to Channel Uploaded from authorPOINTLite Insert YouTube videos in PowerPont slides with aS Desktop Copy embed code: (To copy code, click on the text box) Embed: URL: Thumbnail: WordPress Embed Customize Embed The presentation is successfully added In Your Favorites. Views: 37 Category: Education License: All Rights Reserved Like it (0) Dislike it (0) Added: January 16, 2012 This Presentation is Public Favorites: 0 Presentation Description No description available. Comments Posting comment... Premium member Presentation Transcript Surface area of cubes and cuboids : Surface area of cubes and cuboids Lesson objective: To be able: to understand and calculate the surface area of cubes and cuboids. [Level 5/6] Key words: cubes cuboids Starter: Find the area of the shapes : 2 cm 4 cm 3 cm Slide 2: How many faces has a cube? 2 2 2 What’s the shape of each face? What is a cube??? What’s the area of the one face? So, the total surface area of the cube is Area of cube Slide 3: Work individually Slide 4: The top and the bottom face of cuboid have the same area. How much is the area of the top face? Area of cuboid How much is the area of the bottom face? 2 1 3 A cuboid has 6 faces. Slide 5: A cuboid has 6 faces. The front and the back face of cuboid have the same area. How much is the area of the front face? How much is the area of the back face? 2 1 3 Area of cuboid Slide 6: A cuboid has 6 faces. The right end and the left end face of cuboid have the same area. How much is the area of the right end face? How much is the area of the left end face? 2 1 3 Area of cuboid Slide 7: Surface area of cuboid = S = Surface area of cuboid = 22 cm² . 2 x (1 x 2) Top and bottom Area of cuboid + 2 x (2 x 3) Front and back 3 1 2 + 2 x (1 x 3) Right and left end Slide 8: Surface area of cuboid = S = Surface area of cuboid = 2wl + 2lh + 2wh . 2 x wl Top and bottom Area of cuboid + 2 x lh Front and back h w l + 2 x wh Right and left end. Slide 9: Find the surface area of the cuboid. Front: 4x8 = 32cm² Work individually… So, back: 4x8 = 32cm² Top: 4x5 = 20 cm² So, bottom: 4x5 = 20cm² 8 cm 4 cm 5 cm Right end: 5x8 = 40cm² So, left end: 4x8 = 40cm² Surface area = 20 + 20 + 32 + 32+ 40 + 40 =4 = 40 + 64 + 80 = 184 cm² Slide 10: Work in pairs… a 280 cm2 b 132 cm2 c 310 cm2 d 92 cm2 Slide 11: PLENARY... Uncle Mike found that the area of this cube is 4 cm. Explain why his answer is wrong. 2 cm You do not have the permission to view this presentation. In order to view it, please contact the author of the presentation.
Y8MA3G_Surface area of cubes and cuboids_19_01_2012 Miss_Karampela Download Post to : URL : Related Presentations : Share Add to Flag Embed Email Send to Blogs and Networks Add to Channel Uploaded from authorPOINTLite Insert YouTube videos in PowerPont slides with aS Desktop Copy embed code: (To copy code, click on the text box) Embed: URL: Thumbnail: WordPress Embed Customize Embed The presentation is successfully added In Your Favorites. Views: 37 Category: Education License: All Rights Reserved Like it (0) Dislike it (0) Added: January 16, 2012 This Presentation is Public Favorites: 0 Presentation Description No description available. Comments Posting comment... Premium member Presentation Transcript Surface area of cubes and cuboids : Surface area of cubes and cuboids Lesson objective: To be able: to understand and calculate the surface area of cubes and cuboids. [Level 5/6] Key words: cubes cuboids Starter: Find the area of the shapes : 2 cm 4 cm 3 cm Slide 2: How many faces has a cube? 2 2 2 What’s the shape of each face? What is a cube??? What’s the area of the one face? So, the total surface area of the cube is Area of cube Slide 3: Work individually Slide 4: The top and the bottom face of cuboid have the same area. How much is the area of the top face? Area of cuboid How much is the area of the bottom face? 2 1 3 A cuboid has 6 faces. Slide 5: A cuboid has 6 faces. The front and the back face of cuboid have the same area. How much is the area of the front face? How much is the area of the back face? 2 1 3 Area of cuboid Slide 6: A cuboid has 6 faces. The right end and the left end face of cuboid have the same area. How much is the area of the right end face? How much is the area of the left end face? 2 1 3 Area of cuboid Slide 7: Surface area of cuboid = S = Surface area of cuboid = 22 cm² . 2 x (1 x 2) Top and bottom Area of cuboid + 2 x (2 x 3) Front and back 3 1 2 + 2 x (1 x 3) Right and left end Slide 8: Surface area of cuboid = S = Surface area of cuboid = 2wl + 2lh + 2wh . 2 x wl Top and bottom Area of cuboid + 2 x lh Front and back h w l + 2 x wh Right and left end. Slide 9: Find the surface area of the cuboid. Front: 4x8 = 32cm² Work individually… So, back: 4x8 = 32cm² Top: 4x5 = 20 cm² So, bottom: 4x5 = 20cm² 8 cm 4 cm 5 cm Right end: 5x8 = 40cm² So, left end: 4x8 = 40cm² Surface area = 20 + 20 + 32 + 32+ 40 + 40 =4 = 40 + 64 + 80 = 184 cm² Slide 10: Work in pairs… a 280 cm2 b 132 cm2 c 310 cm2 d 92 cm2 Slide 11: PLENARY... Uncle Mike found that the area of this cube is 4 cm. Explain why his answer is wrong. 2 cm