Wednesday, February 16, 2011

Homework Book Pages 4, 6, and 8










a= l x w
a= 15 x 12
a= 180cm²

v= area of base x height
v= 180cm² x 3cm
v= 540cm³










a= l x w
a= 8.5 x 7
a= 59.5cm²

v= area of base x height
v= 59.5m² x 2m
v= 119m³













a= l x w
a= 20 x 8
a= 160cm²

v= area of base x height
v= 160cm² x 16cm
v= 2560cm³





















v= b x h/2 x h²
7.2 x 4.5/2 = 32.4cm²
v= 32.4cm² x 10cm
v= 324cm³















v= b x h/2 x h²
3 x 5/2 = 7.5m²
v= 7.5m² x 8.5m
v= 63.75m³

c) A prism where the base of the triangle is 4m, the height of the triangle is 5m, and the prism height is 12m.

v= b x h/2 x h²
4 x 5/2 = 10m²
v= 10m² x 12m
v= 120m³















Pear juice:

a= l x w
a= 9 x 6
a= 54cm²

v= area of base x height
v= 54cm² x 4.5cm
v= 243cm³

Pineapple juice:

a= l x w
a= 10 x 6
a= 60cm²

v= area of base x height
v= 60cm² x 3.75cm
v= 225cm³

The second juice box holds more.

Here's a link that tells you more about volume.

This tells you how to find the volume of a rectangular prism.






Cylinder Volume and Volume Problems








d/2= r
8/2= r
4m= r

V= π x r x r x h
V= (3.14 x 4 x 4) x 10
V= 50.24m^2 x 10m
V= 502.4m^3

502.4m^3/2 = 251.2m^3The volume of the semicircular trough is 251.2m^3.

























Outside:
d/2= r
1/2= r
0.5m= r

V= π x r x r x h
V= (3.14 x 0.5 x 0.5) x 10
V= 0.785m^2 x 10m
V= 7.85m^3

Inside:
d/2= r
0.8/2= r
0.4m= r

V= π x r x r x h
V= (3.14 x 0.4 x 0.4) x 10
V= 0.5024m^2 x 10m
V= 5.024m^3

7.85m^3 - 5.024m^3 = 2.8m^3

4 comments:

  1. I liked your pictures! Next time add some color to your text.

    ReplyDelete
  2. Great post Kim. Your post was very neat and well explained.

    ReplyDelete
  3. Good post Kim. Next time, add more colors to your post. Other than that great job!

    ReplyDelete
  4. Great job Kim. Your post was very neat and it was really easy to understand. I also liked how you bolded the answers because there were no colors. I think you have the same problem as me. I can't put any colors on my posts either. Great job.

    ReplyDelete