Question

atics 20 - 3
unit c: surface area
summary
review what you have learned before you practise on your own:
surface area of pyramids

• an organized way to find the area of a pyramid is to use a
• the faces of a pyramid are
• there is only

base in a pyramid.
surface area of cylinders

• the key to remember is that the width of the rectangular section of a cylinder is equal to the

of the circular bases.

• the general formula for surface area of a cylinder is (sa_{cyl}=)
• the general formula is made up of two

bases plus a
surface area of cones

• the general formula for the surface area of a cone is (sa_{cone}=)
• the general formula is made up of the base that has a formula of

and a partial circle with a formula of
key terms

Explanation:

For pyramids, a net helps find area, faces are triangles, and there is one base. For cylinders, width of rectangular - part equals circumference of bases, formula is $SA_{cyl}=2\pi r^{2}+2\pi rh$ (two circular bases and a rectangular lateral - surface). For cones, formula is $SA_{cone}=\pi r^{2}+\pi rl$, with base formula $\pi r^{2}$ and partial - circle (lateral surface) formula $\pi rl$.

Answer:

1. net
2. triangles
3. one
4. circumference
5. $2\pi r^{2}+2\pi rh$
6. circular; rectangular lateral - surface
7. $\pi r^{2}+\pi rl$
8. $\pi r^{2}$
9. $\pi rl$