Showing posts with label Pg. 80-81. Show all posts
Showing posts with label Pg. 80-81. Show all posts

Wednesday, February 16, 2011

Homework Book- Pg.80-81 #5, 7, 9

5. Calculate the volume of each cube.
-Express your volume to the nearest tenth.





7.
Calculate the volume of the contents of each container.




9. A contractor if buying cement for 100 triangular parking barriers. How much concrete does she need?



She needs 7.2m of concrete.





Cylinder Volume and Volume Problems



Jumbo
r=d/2
r=20/2
r=10cm

v=π x r x r x h
v=(3.14 x 10 x10) x 40
v=314cm^2 x 40cm
v=12560cm^3

Popcorn Lover's
r=d/2
r=30/2
r-15cm

v=π x r x r h
v=(3.14 x 15 x 15) x 20
v=706.5cm^2 x 20
v=14130cm^3

Martha should buy the Popcorn Lover's container.


a)
v=l x w x h
v=10 x 10 x16
v=1600cm^3

v=l x w x h
v=5 x 6 x 10
v=300cm^3

v=1600cm^3 - 300cm^3
v= 1300cm^3

b) You can check your calculations by dividing the shape into a different set of rectangular prisms.