Question

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
surface area
net
pyramid
cylinder
cone

Explanation:

1. For pyramids, a net is used to find area. Faces are triangles and there is 1 base.
2. For cylinders, width of rectangular - section is circumference of circular bases. Formula $SA_{cyl}=2\pi r^{2}+2\pi rh$, with 2 circular bases and a rectangular section.
3. For cones, formula $SA_{cone}=\pi r^{2}+\pi rl$. Base formula is $\pi r^{2}$ and partial - circle (lateral area) formula is $\pi rl$.

Answer:

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