Geometry Unit 9 Lesson 3 (12/16)

Monday
12/16/2013
Notes:
12.3 Surface Areas of Pyramids and Cones
12.5 Volumes of Pyramids and Cones
G.14a, G.13

p. 843 – 844 – #7, 9, 13, 19, 25, 28, 32

p. 860 – 861 – #11, 12, 13, 16, 18, 24, 29, 37

Unit 9 Lesson 3

Clean sheet: Titled “Lesson 2: Prisms and Cylinders”

  • Naming Pyramids “Base + Pyramid”

  • Volume of a Prism: Bh where B is the area of the base.

  • Volume of a Pyramid: 1/3 a Prism
  • Volume of a Cylinder: Bh where B is the area of the base (pi r^2)

  • Volume of a Cone: 1/3 a Cylinder

Examples 1-4: Find the Volume.

Slide1

  • Lateral Area: Area of the faces of a polyhedron not including bases.

  • l is Slant Height
  • Surface Area of a Pyramid: 1/2 lp +B

  • Surface Area of a Cone: 1/2 lp + B

  • But the perimeter of a circle is the circumference or 2pi r. and the B=pi r^2

  • So the SA of a Cylinder: l(pi r)+(pi r^2)

Examples 5-8: Find the Lateral and Total Surface Area.

Slide1

GUIDED PRACTICE

Whiteboards

Practice with solving the V and SA of all Solids so far.

https://docs.google.com/presentation/d/1h9o5TFCdV5qjRIIRZcB4e3zRNlpAwik_7dE8REt8SzE/pub?start=false&loop=false&delayms=3000

CLOSING

  • Pass out Black Folders and have students assemble their notebooks.

  • Number each page.

  • Collect Notebooks.

  • Clean desks

  • Check on Lesson 1 Vocabulary
  • (If we finish then they can start on homework)

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