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Do Now. 5/16/2014 10 -4 B Volume and Surface Area of Composite Figures. COMPOSITE Figures :. A figure made up of two or more three-dimensional shapes. Examples of composite shapes. How to find Volume of composite shapes…. Determine what individual shapes make up the larger shape itself.

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  1. Do Now

  2. 5/16/2014 10-4 B Volume and Surface Area of Composite Figures

  3. COMPOSITE Figures: • A figure made up of two or more three-dimensional shapes.

  4. Examples of composite shapes

  5. How to find Volume of composite shapes… • Determine what individual shapes make up the larger shape itself. • Find the volume of each shape separately. • Add the volume of all of the shapes.

  6. Example 1 Find the volume of the composite figure. Use 3.14 for π.

  7. Example 1 Find the volume of each figure. The total volume is about 105 + 78.5 or 183.5 cubic inches. Rectangular Prism Cylinder V = bwh V = 5 ● 3 ● 7 V = 105 V = πr2h V ≈3.14 ● 2.52 ● 4 V ≈ 78.5

  8. Example 2 A house is in the shape of the composite figure shown. Find the surface area of the composite figure. The composite figure is made up of two different figures: a rectangular prism and a rectangular pyramid.

  9. Prism S.A. = 2bh + bw + 2hw S.A. = 2(8 ● 8) + (8● 7) + 2(8● 7) S.A. = 128 + 56 + 112 S.A. = 296

  10. PyramidThe pyramid surfaces that you are finding are triangles with a height of 4 feet.Two of the triangles have a base of 8 feet and two have a base of 7 feet. The total surface area of the figure is 296 + 60 or 356 square feet.

  11. Example 3

  12. What individual shapes make up the figure? The stepping stool is made up of 2 different rectangular prisms. Find the volume of each prism.

  13. Find the volume of each shape separately then add… V = bwh V = bwh V = 16 • 12 • 7 V = 1,344 V = 10 • 12 • 7 V = 840 Answer: The volume of the stepping stool is1,344 + 840 or 2,184 cubic inches.

  14. Example 4 V = πr²h V = 84.8 ft³ V = πr²h 3

  15. Surface Area of Composite Figures

  16. How to find S.A. of composite shapes… • Mentally separate the composite shape into their individual shapes. • Find the S.A. of each shape. • Add all of the surface areas together. • Find the areas of each touching surface shape, then subtract those from the total S.A.

  17. Example 5 We are going to use our steps to find the surface area of the stepping stool. Mentally separate the composite shape into simpler individual shapes.

  18. Find the area of each outside surface of each shape. A = bh + bh A = (14 • 10) + (6 • 7) A = 182 Remember: there are 2 of these sides A = bh A = 10 • 12 A = 120 A = bh A = 14 • 12 A = 168

  19. Find the area of each outside surface of each shape. A = Bh A = 7 • 12 A = 84 Remember: there are 2 of these sides A = Bh A = 16 • 12 A = 192 A = Bh A = 6 • 12 A = 72

  20. Add all of the areas together. 182 x2 168 120 72 84 x2 192 The total surface area of the stepping stool is (2 • 182) + 120 + 168 + 192 + 72 + (2 • 84) or 1,084 square inches.

  21. Exit Ticket

  22. 2008.7m3 936in3

  23. Homework • Pg. 628 #1-20 Evens • Quiz Corrections due next Friday (5/23) • Test Wednesday!

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