Download - Tastey Tuesday!
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Tastey Tuesday!• Your new Pi Day question is coming on the
next slide…• Read until we begin!
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Submit your Pi Day answer!
The London Eye is an observation wheel above the River Thames in London. The diameter of the wheel is greater than 135 and less than 140 meters. Describe the range of possible radii and circumferences of the wheel rounded to the nearest meter.
• Label your answer, be sure your name is on it, and ask yourself: did I answer the question being asked?
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VOLUME
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So far, we have learned about length. This is a
measure of 1 dimension.
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Measuring length can be as simple as measuring a straight
line segment.
5 inches
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When you measure perimeter, you are also measuring length.
5 ft4 ft
3 ft
5 + 4 + 3 = 12 ft
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When you measure circumference, you are also
measuring length.
4 cm 4 x 3.14 = 12.56cm
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Area is a measure of 2 dimensions:
Length & Width
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You can find the area of any FLAT shape.
5 cm
11 cm
5 x 11 = 55 square cm
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You can even find the area of a circle.
5 cm 5 x 5 x 3.14 =
78.5 sq. cm
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Volume is a measure of 3 dimensions:
LENGTH, WIDTH, & HEIGHT
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Imagine starting with a piece of rectangular paper.
3 in
4 in
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The area of this rectangle is 12 square inches
3 in
4 in
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Now, suppose that we “stacked” another piece of paper on top of this
piece of paper.
3 in
4 in
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3 in
4 in
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3 in
4 in
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3 in
4 in
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3 in
4 in
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3 in
4 in
Now we have 2 pieces of paper, each with an area of 12. So the
volume is 24.
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3 in
4 in
Let’s add another piece of paper to the stack.
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3 in
4 in
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3 in
4 in
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3 in
4 in
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3 in
4 in
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3 in
4 in
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3 in
4 in
Now we have 3 pieces of paper, each with an area of 12. So the
volume is 36.
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If we had 100 pieces of paper stacked on top of one another, what would the volume be?
4 in
3 in
100
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4 x 3 x 100 = 1200
4 in
3 in
100
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What are the units for volume?
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Now that we are working with
all 3 dimensions, the units are cubes.
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This is 1 cubic inch.1 x 1 x 1
1 in1 in
1 in
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This is 2 cubic inches.2 x 1 x 1
2 in1 in
1 in
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This is 4 cubic inches.2 x 1 x 2
2 in1 in
2 in
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2 in2 in
2 in
8 cubic inches 2 x 2 x 2
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Calculate the volume of this prism.
5 cm
8 cm6 cm
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The volume is 240 cubic cm.6 x 5 x 8
5 cm
8 cm6 cm
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Calculate the volume of this prism.
3 cm
12 cm5 cm
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The volume is 180 cubic cm.5 x 3 x 12
3 cm
12 cm5 cm
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Calculate the volume of this prism.
4 cm
11 cm7 cm
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The volume is 308 cubic cm.7 x 4 x 11
4 cm
11 cm7 cm
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Volume can also be described as AREA of the base x Height
V= Bh
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Suppose that the area of this rectangle is 12.
4
3
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Suppose that this rectangle served as the base of a
rectangular prism.
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Suppose that the prism has a height of 2.
2
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2
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2
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If the area (length x width) of the base is 12, and the height is 2…
2
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then the volume should be 24 cubic units.
2
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Therefore, if you know the area of the base and the height of the prism, then you can calculate the
volume.
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SUMMARY
Volume = Length x Width x Height
Volume = Area of Base x Height
V = Bh
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Practice Time!
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1) Find the volume of the prism.
3 cm
3 cm
8 cm
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The volume is 72 cm3.3 x 8 x 3
3 cm
3 cm
8 cm
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2) Find the volume of the prism.
5 in
5 in
12 in
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The volume is 300 in3.12 x 5 x 5
5 in
5 in
12 in
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3) Find the volume of the prism.
2.5 ft
Area = 20 ft2
base
base
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Volume = area x heightVolume = 20 x 2.5 = 50 ft3
2.5 ft
Area = 20 ft2
baseba
se
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4) Find the volume of the prism.
14 m
Area = 12 m2
baseba
se
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Volume = area x heightVolume = 12 x 14 = 168 m3
14 m
Area = 12 m2
base
base
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5) Find the volume of the prism.
25 cm
Area = 15 cm2
basebase
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Volume = area x heightVolume = 15 x 25 = 375 cm3
25 cm
Area = 15 cm2
basebase
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6) Find the volume of the cylinder.
10 in
Area = 78.5 in2
base
base
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Volume = area x heightVolume = 78.5 x 10 = 785 in3
10 in
Area = 78.5 in2
base
base
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7) Find the volume of shape.
12 m
Area = 36.2 m2
basebase
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Volume = area x heightVolume = 36.2 x 12 = 434.4 m3
12 m
Area = 36.2 m2
basebase
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8) Find the volume of the triangular prism.
10ft15ft
8ft
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Area of base = 8 x 10 ÷ 2 = 40 ft2
40 x 15 = 600 ft3
10ft15ft
8ft
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9) Find the volume of the triangular prism.
8m12m
6m
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8m12m
6m
Area of base = 6 x 8 ÷ 2 = 24 ft2
24 x 12 = 288 m3
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10) Find the volume of the triangular prism.
7 cm11 cm
6cm
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7 cm11 cm
6cm
Area of base = 6 x 7 ÷ 2 = 21 ft2
21 x 11 = 231 m3
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11) Find the volume of the cylinder.
6 in
3 in
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Area of base = 3 x 3 x 3.14 = 28.26 in2
28.26 x 6 = 169.56 in3
6 in
3 in
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12) Find the volume of the cylinder.
8 km
5 km
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8 km
5 km
Area of base = 5 x 5 x 3.14 = 78.5 km2
78.5 x 8 = 628 km3
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13) Find the volume of the cylinder.
11 m
8 m
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11 m
8 m
Area of base = 8 x 8 x 3.14 = 200.96 m2
200.96 x 11 = 2210.56 m3
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Homework:Complete Worksheet
Practice A/ B/ C/ Problem Solving