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10-7 Volume of Prisms Course 1 Warm Up Warm Up Lesson Presentation Lesson Presentation Problem of the Day Problem of the Day

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Volume is the number of cubic units needed to fill a space. Course 1 10-7 Volume of Prisms

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It takes 10, or 5 · 2, centimeter cubes to cover the bottom layer of this rectangular prism. There are 3 layers of 10 cubes each to fill the prism. It takes 30, or 5 · 2 · 3, cubes. Volume is expressed in cubic units, so the volume of the prism is 5 cm · 2 cm · 3 cm = 30 cm 3. Course 1 10-7 Volume of Prisms

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Additional Example 1: Finding the Volume of a Rectangular Prism Find the volume of the rectangular prism. V = lwh Write the formula. V = 26 11 13l = 26; w = 11; h = 13 Multiply.V = 3,718 in 3 13 in. 26 in. 11 in. Course 1 10-7 Volume of Prisms

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Check It Out: Example 1 Find the volume of the rectangular prism. V = lwh Write the formula. V = 29 12 16l = 29; w = 12; h = 16 Multiply.V = 5,568 in 3 16 in. 29 in. 12 in. Course 1 10-7 Volume of Prisms

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To find the volume of any prism, you can use the formula V= Bh, where B is the area of the base, and h is the prism’s height. So, to find the volume of a triangular prism, B is the area of the triangular base and h is the height of the prism. Course 1 10-7 Volume of Prisms

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Additional Example 2A: Finding the Volume of a Triangular Prism Find the volume of each triangular prism. V = BhWrite the formula. V = ( 3.9 1.3) 4 1 2 __ B = 3.9 1.3; h = 4. 1 2 __ Multiply.V = 10.14 m 3 Course 1 10-7 Volume of Prisms

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Additional Example 2B: Finding the Volume of a Triangular Prism Find the volume of the triangular prism. V = BhWrite the formula. V = ( 6.5 7) 6 1 2 __ B = 6.5 7; h = 6. 1 2 __ Multiply.V = 136.5 ft 3 Course 1 10-7 Volume of Prisms

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Check It Out: Example 2A Find the volume of each triangular prism. V = BhWrite the formula. V = ( 4.2 1.6) 7 1 2 __ B = 4.2 1.6; h = 7. 1 2 __ Multiply.V = 23.52 m 3 1.6 m 7 m 4.2 m Course 1 10-7 Volume of Prisms

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Check It Out: Example 2B Find the volume of each triangular prism. V = BhWrite the formula. V = ( 4.5 9) 5 1 2 __ B = 4.5 9; h = 5. 1 2 __ Multiply. V = 101.25 ft 3 4.5 ft 5 ft 9 ft Course 1 10-7 Volume of Prisms

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To find the volume of a cylinder, you can use the same method as you did for prisms: Multiply the area of the base by the height. volume of a cylinder = area of base height The area of the circular base is r 2, so the formula is V = Bh = r 2 h. Course 1 10-8 Volume of Cylinders

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Additional Example 1A: Finding the Volume of a Cylinder Find the volume V of the cylinder to the nearest cubic unit. Write the formula. Replace with 3.14, r with 4, and h with 7. Multiply. V 351.68 V = r 2 h V 3.14 4 2 7 The volume is about 351.68 ft 3. Course 1 10-8 Volume of Cylinders

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Additional Example 1B: Finding the Volume of a Cylinder 10 cm ÷ 2 = 5 cmFind the radius.Write the formula. Replace with 3.14, r with 5, and h with 11. Multiply. V 863.5 V = r 2 h V 3.14 5 2 11 The volume is about 863.5 cm 3. Course 1 10-8 Volume of Cylinders

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Additional Example 1C: Finding the Volume of a Cylinder Find the radius. r = + 4 h 3 __ r = + 4 = 7 9 3 __ Substitute 9 for h.Write the formula. Replace with 3.14, r with 7, and h with 9. Multiply. V 1,384.74 V = r 2 h V 3.14 7 2 9 The volume is about 1,384.74 in 3. Course 1 10-8 Volume of Cylinders

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Check It Out: Example 1A Find the volume V of each cylinder to the nearest cubic unit. Multiply. V 565.2 The volume is about 565.2 ft 3. 6 ft 5 ft Write the formula. Replace with 3.14, r with 6, and h with 5. V = r 2 h V 3.14 6 2 5 Course 1 10-8 Volume of Cylinders

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Check It Out: Example 1B Multiply. V 301.44 8 cm ÷ 2 = 4 cm The volume is about 301 cm 3. Find the radius. 8 cm 6 cm Write the formula. Replace with 3.14, r with 4, and h with 16. V = r 2 h V 3.14 4 2 6 Course 1 10-8 Volume of Cylinders

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Lesson Quiz Find the volume of each figure. 1. rectangular prism with length 20 cm, width 15 cm, and height 12 cm 2. triangular prism with a height of 12 cm and a triangular base with base length 7.3 cm and height 3.5 cm 3. Find the volume of the figure shown. Insert Lesson Title Here 3,600 cm 3 153.3 cm 3 38.13 cm 3 Course 1 10-7 Volume of Prisms

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