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Pre-Algebra: Chapter 12-6
Surface Area of Pyramids and Cones
You know how to the do the surface area of pyramids. First, do the area of the base, it can be a square, triangle or even a hexagon like I showed you my deck lamp from the 1700’s-1800’s. Then, you can do the area of the triangles, remembering that the area `A=(1/2)b*h`. Multiply the number of FACES by the area of just one of the triangular faces and add it to the base.
For cones, the bottom area is just the area of a circle, `A=pir^2` and the area of the lateral stuff is `A=pi*r*l` where `l` is the slant height of the cone.
Try a couple, you’ll get the hang of it!
Algebra: Chapter 12 Review
200 point TEST TOMORROW! Make sure you go over the following and know what they mean:
- 12-1
- relation
- domain
- range
- function
- 12-2 graphing a function
- 12-3 linear function
- 12-4
- quadratic function
- parabola
- vertex
- 12-5 direct variation
- 12-6 inverse variation
- 12-7
- joint variation
- combined variation