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MA 08Geometry

MA 08Geometry. 7.5 Volume of Prisms and Cylinders. Goals. Find the volume of prisms. Find the volume of cylinders. Solve problems using volume. Volume. The number of cubic units contained in a solid. Measured in cubic units. Basic Formula: V = Bh B = area of the base, h = height.

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MA 08Geometry

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  1. MA 08Geometry 7.5 Volume of Prisms and Cylinders

  2. Goals • Find the volume of prisms. • Find the volume of cylinders. • Solve problems using volume. Geometry 12.4 Volume of Prisms and Cylinders

  3. Volume • The number of cubic units contained in a solid. • Measured in cubic units. • Basic Formula: V = Bh • B = area of the base, h = height Geometry 12.4 Volume of Prisms and Cylinders

  4. Cubic Unit V = s3 V = 1 cu. unit s 1 1 s 1 s Geometry 12.4 Volume of Prisms and Cylinders

  5. Prism: V = Bh B B h h h B Geometry 12.4 Volume of Prisms and Cylinders

  6. Cylinder: V = r2h r B h h V = Bh Geometry 12.4 Volume of Prisms and Cylinders

  7. 8 3 10 Example 1 Find the volume. Triangular Prism V = Bh Base = 40 V = 40(3) = 120 Abase = ½ (10)(8) = 40 Geometry 12.4 Volume of Prisms and Cylinders

  8. Example 3 A soda can measures 4.5 inches high and the diameter is 2.5 inches. Find the approximate volume. V = r2h V = (1.252)(4.5) V  22 in3 (The diameter is 2.5 in. The radius is 2.5 ÷ 2 inches.) Geometry 12.4 Volume of Prisms and Cylinders

  9. Example 4 A wedding cake has three layers. The top cake has a diameter of 8 inches, and is 3 inches deep. The middle cake is 12 inches in diameter, and is 4 inches deep. The bottom cake is 14 inches in diameter and is 6 inches deep. Find the volume of the entire cake, ignoring the icing. Geometry 12.4 Volume of Prisms and Cylinders

  10. Example 4 Solution VTop = (42)(3) = 48  150.8 in3 VMid = (62)(4) = 144  452.4 in3 VBot = (72)(6) = 294  923.6 in3 r = 4 8 3 r = 6 12 4 486  1526.8 in3 14 6 r = 7 Geometry 12.4 Volume of Prisms and Cylinders

  11. Concrete Pipe Geometry 12.4 Volume of Prisms and Cylinders

  12. Example 5 A manufacturer of concrete sewer pipe makes a pipe segment that has an outside diameter (o.d.) of 48 inches, an inside diameter (i.d.) of 44 inches, and a length of 52 inches. Determine the volume of concrete needed to make one pipe segment. 48 44 52 Geometry 12.4 Volume of Prisms and Cylinders

  13. View of the Base Example 5 Solution Strategy: Find the area of the ring at the top, which is the area of the base, B, and multiply by the height. Geometry 12.4 Volume of Prisms and Cylinders

  14. Example 5 Solution Strategy: Find the area of the ring at the top, which is the area of the base, B, and multiply by the height. Area of Outer Circle: Aout = (242) = 576 Area of Inner Circle: Ain = (222) = 484 Area of Base (Ring): ABase = 576 - 484 = 92 48 44 52 Geometry 12.4 Volume of Prisms and Cylinders

  15. Example 5 Solution V = Bh ABase = B = 92 V = (92)(52) V = 4784 V  15,021.8 in3 48 44 52 Geometry 12.4 Volume of Prisms and Cylinders

  16. Example 6 4 5 L A metal bar has a volume of 2400 cm3. The sides of the base measure 4 cm by 5 cm. Determine the length of the bar. Geometry 12.4 Volume of Prisms and Cylinders

  17. V = L  W  H 2400 = L  4  5 2400 = 20L L = 120 cm Example 6 Solution 4 5 L Geometry 12.4 Volume of Prisms and Cylinders

  18. Summary • The volumes of prisms and cylinders are essentially the same: V = Bh & V = r2h • where B is the area of the base, h is the height of the prism or cylinder. • Use what you already know about area of polygons and circles for B. Geometry 12.4 Volume of Prisms and Cylinders

  19. r B h h V = r2h V = Bh These are on your reference sheet. Geometry 12.4 Volume of Prisms and Cylinders

  20. 2.3 in 4 in 4.5 in 3.2 in 1.6 in Which Holds More? This one! Geometry 12.4 Volume of Prisms and Cylinders

  21. What would the height of cylinder 2 have to be to have the same volume as cylinder 1? r = 3 r = 4 #2 #1 8 h Geometry 12.4 Volume of Prisms and Cylinders

  22. Solution r = 4 #1 8 Geometry 12.4 Volume of Prisms and Cylinders

  23. Solution r = 3 #2 h Geometry 12.4 Volume of Prisms and Cylinders

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