10.4 surface area of prisms & cylinders 1

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10.4 surface area of prisms & cylinders 1

  1. 1.  In 1861 the Union’s population was 23,000,000 people and the Confederacy’s was 9,000,000. In the U.S. Civil War, the cost to the Union was about $3.2 billion, and the cost to the Confederacy was about $2 billion  How much money did the Union spend for each person in the Union?  How much money did the Confederacy spend for each person in the Confederacy ?
  2. 2.  In 1861 the Union’s population was 23,000,000 people and the Confederacy’s was 9,000,000. In the U.S. Civil War, the cost to the Union was about $3.2 billion, and the cost to the Confederacy was about $2 billion  How much money did the Union spend for each person in the Union?  $139.13  How much money did the Confederacy spend for each person in the Confederacy ?  $222.22
  3. 3. Lesson 10.4, For use with pages 542-547Identify the solid.1.2. Count the number of faces, edges, and vertices for the figure.
  4. 4. Lesson 10.4, For use with pages 542-547Identify the solid.1. ANSWER triangular prism2. Count the number of faces, edges, and vertices for the figure. ANSWER 5; 9; 6
  5. 5. Surface Area of Prisms & Cylinders Section 10.4 P. 542
  6. 6. Vocabulary Surface Area: (SA) of a polyhedron is the sum of the areas of all the faces. Prism: a polyhedron that has two congruent faces that are parallel polygons. Each parallel, congruent face is called a base.  Prisms are named for the shape of their bases.
  7. 7.  If you were to find the surface area of rectangular prism, what measurements would you need to know?
  8. 8.  You would need the length, width, and the height of the prism.Think front and back 5 inTop and bottomL/R Sides 2 in 9 in
  9. 9.  Find the SA of the rectangular prismFront: A = b x h 30 x 12 = 360 12 ftSide: A = b x h 30 x 10 = 300Top: A = b x h 30 ft 12 x 10 = 120360+360+300+ 10 ft300+120+120= 1560 ft sq.
  10. 10.  Find the SA of this triangular prismTriangle A= b x h ÷ 2 (5 x 7) ÷ 2= 17.5Rectangle A = b x h 15 x 5 = 75 5 517.5 + 17.5 + 75 15 ft 7 +75 + 75= 7260 ft sq. 5
  11. 11. Base: A = b x h ÷ 2 6 ft 15 ft (9x12) ÷ 2= 54 Bottom: A = b x h9 ft 12 x 6 = 72 Top: A=bxh 12 ft Find SA 15 x 6 = 90Think : Left back: A = b x h2 Bases (f/b)Bottom 6 x 9 = 54Slanted Top 54 + 54 + 90 + 54 +72 = 324 ft s q.Left Back
  12. 12. Homework Page 546 #6-8, 13.

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