Warm Up
Solve
2x2=98 for x.
Nov 2­10:35 AM
Quick Review...
A can of soup has a radius of 4 cm. What is
the diameter of the can?
What is the area of the lid?
Recall A =
πr2
Nov 7­10:53 AM
1
What is the volume of a cylinder?
V = _______
or Volume = area of the _____X height
volume is written in ______ units
Click on the can for a Khan Academy example!
Nov 2­10:38 AM
Let's try one together... (foldable)
4 cm
V=
6 cm
Nov 2­10:48 AM
2
Grain is stored in cylindrical structures
called silos. Estimate the volume of a
silo with a diameter 11.1 feet and a
height of 20 feet.
Nov 2­1:51 PM
What if we already know the volume. How can we then find the radius?
For example:
Samir opened a jar of peanut butter that had 96 πcm3 of peanut
butter in it. He didn't want to eat the entire jar, so he needed to
find a lid to cover the jar. The height of the jar is 4 cm. What is
the radius?
volume=
height=
radius= _____?
Would a lid that has an area of 25 cm2 fit
the jar of peanut butter?
Nov 2­12:34 PM
3
Homework~
green workbook page 60 #2, 6, 10, and 12
*** #10 is VERY important
Nov 2­1:43 PM
Volume of Cones
Take a guess...
How many cones would fill a cylinder with
the same height and radius???
Nov 2­1:57 PM
4
It takes ____ cones to fill a cylinder with the same height and radius. If the formula for volume of a cylinder is V = π r2h
Then the formula for volume of a cone must be...
1
V = π r2 h
3
Nov 7­12:17 PM
Let's try... (put this example in your foldable)
Calculate the volume of the given cone.
diameter (radius is 1/2 the diameter)
m
4 9 m
height
Nov 8­8:11 AM
5
(in foldable)
Pete wanted to figure out the length of the radius of
his waffle cone. He could fill his waffle cone with 84.78 in3
of ice cream. If the height of the cone is 9 inches,
what is the radius?
Nov 8­8:12 AM
Now turn in your GREEN workbook to page 61. Complete the following problems:
2, 3, 6, 8, 10
Nov 8­9:37 AM
6
Nov 8­9:47 AM
7