## Wednesday, January 26, 2011

### Page 180-181 Questions Number 2,4,6, and 8

QUESTIONS:

2. A right rectangular prism has six faces. Why might you have to find the area of only three of the faces to be able to find the surface area? Use pictures and words to explain your thinking.

4. Find the surface area of this CD case.

6. Cheese is sometimes packaged in a triangular box. How much cardboard would you need to cover this piece of cheese if you do not include overlapping? Calculate your answer to the nearest tenth of a square centimeter.

8. Paco builds a glass greenhouse.

a) How many glass faces does the greenhouse have?

b) How much glass does Paco need to buy?

:

2.) I only need to find 3 faces instead of 6 to be able to find the surface area because rectangular prisms share sides. 2 tops, 2 sides, and 2 fronts.

4.) First, you have to find the length and width of each views. For the top view, it's 1cm x 12.3cm, there's 2 top views so it would be 1cm x 12.3 on the other side too. Front view is 14 cm x 12.3 cm, same as the other side. Side view is 14 cm x 1 cm, same as the other side.

6.) A triangular prism has 2 triangles and 3 rectangles.First, we have to find the length and width of the triangles,or rectangles (which ever way you want to start it).We have to use the formula.For rectangle, the formula is b x h =n.The formula for the triangle is b x h divided by 2=n.

8.) Do the steps shown in number 6.
a.) There are 4 glass faces that a greenhouse have.
b.) Paco needs 6.36 m
2.

What is the rectangular prism's formula?

How many faces does a triangular prism have?

Here are some videos you may want to check out:

HERE ARE SOME LINKS YOU MAY WANT TO CHECK OUT:

http://www.math.com/tables/geometry/surfareas.htm
http://easycalculation.com/area/learn-rectangular-prism.php
http://www.aaamath.com/geo.html

GAMING SITES:

http://www.shodor.org/interactivate/activities/
http://www.gamequarium.com/math.htm

QUESTION:

(page 266 #8)

150 cm^3 divided by 48cm^2 = 3.125 cm^2
or = 3 cm^2

Simple Sentence: The height of the cylinder to the nearest centimetre is 3 cm^2.

QUESTION:
(page 273 #3)

V = (b x h / 2) x h
V = (1.4 x 1.7 / 2) x 1.18
V = 1.19 x 1.18
V = 1.4042 m^3

1.7 x 4 = 6.8 m <---- Height
1.4 x 4 = 5.6 m <---- Length

a) Yes, he has enough small prisms.

b) 1.4042 m^3 x 16 = 22.4672 m^3 or 22.47 m^3
The volume of the new prism to the nearest hundredths of a metre is 22.47 m^3.

http://www.math.com/tables/geometry/volumes.htm
http://www.online-calculators.co.uk/volumetric/cylindervolume.php
http://www.math10.com/en/geometry/volume.html

QUESTIONS YOU MAY WANT TO SOLVE IN YOUR FREE TIME:
What is the formula to find the volume of a Rectangular Prism?

length=3m, width=4m, height=5. What is the volume of this Rectangular Prism?

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