## Wednesday, January 26, 2011

### Volume Post

a)v=π.r.r.h
v=3.14cmx5cmx5cmx23cm
v=78.5cmx25cm
v=1806.5cm^3
b)v=π.r.r.h
v=3.14cmx14cmx14cmx12cm
v=615.44cmx12cm
v=7385.28cm^3

c)v=π.r.r.h
v=3.14cmx0.5cmx0.5cmx1.5cm
v=12.75cmx1.5cm
v=19.125cm^3

R=D/2
D=o.8cm
0.8cm/2=R
R=0.4cm^3

V=π.r.r.h
V=3.14mx0.4mx0.4mx10m
V=0.5024mx10
V=5.024m^3

Questions: 3,5,7,11

3.Find the surface area to this rectangular prism to the nearest tenth of a cm.

5.Calculate the surface area of this ramp in the shape of a right triangular prism. Give your answer to the nearest tenth of a square metre.

7.Given the area of each face of a right rectangular prism, what is the surface area?

11.Dallas wants to paint three cubes. The cubes measure 1 m × 1 m × 1 m, 2 m × 2 m × 2 m, and 3 m × 3 m × 3 m, respectively. What total surface area will Dallas paint if he decides not to paint the bottoms of the three cubes?

How to find surface area of rectangular prism.
eg:

How to find the surface area of a triangular prism
eg:

#### 1 comment:

1. Sorry if any of you see this and the bottom is small,I made them larger,but when i uploaded them it made it shrink!Sorry.