Vocabulary
What does 3D stand for, and what are they?
Area
l x w
l = 3
w = 5
h = 1
V=?
15
Cut Shape 1 Volume: 34
Cut Shape 2 Volume: 25
Volume of shape put together?
59
Do you ever add when FINDING volume?
NO! Only to add the shapes together of composite figures.
The space and object takes up - length x width x height
Base
l x w
B = 15
h = 2
V=?
Cut shape 2: l=5 w=2 h=3
Volume?
What type of measurement do you use to find a 2D shape?
Area
What is a rectangular prism?
A 3D rectangular shape. 4 sides are rectangles, 2 can be squares or rectangles.
Volume - using 3 dimensions
l x w x h
Slide 2
45
Slide 1
58
If two shapes have the same volume, do they have to have the same dimensions?
No, one could be 2 x 3 x 4 and one could be 6 x 2 x 2.
What is a unit cube?
The tool used to measure volume - 1 unit by 1 unit by 1 unit.
Volume - using 2 numbers
Slide 4
576
Slide 3
32
How do you find the volume of a composite figure?
Cut the shape, hide one, find the volume of the seen shape, hide the other, find the volume of the seen shape, add the two volumes together.
What is a composite shape/figure?
An irregular 3D shape.
Volume of a composite figure
l x w x h of one figure
l x w x h of other figure
add together
Slide 5
72
Slide 6
38
If given the volume of a figure and the height, what could you do to find the base?
Ex: V= 12 h=3
Divide the volume by the height.
Ex: 12 divided by 3 = 4
B=4