2.1 Units of Area and Volume
Chapter 2: Surface Area and Volume
2.1 Units of Area and Volume
Investigate:
1 cm2 = ___________________ mm2
1 square foot = ________________square inches.
Can you find a rule that you can use to convert square units?
Use the rule to convert:
15 km2 = _________________ m2
4 square yards = _______________ square feet.
What about volume?
1 cm3 = _______________ mm3
1 cm3
1 cubic foot = _______________ cubic inches.
1 ft3
In general, to convert area you need to square the conversion factor.
To convert volume you need to cube the conversion factor.
Examples:
•
A = ___ m2
1.3 km
1.8 km
Ch 2 SA and Volume Page 1
• Calculate the area of a rectangle 22 in by 8 inches in square centimetres.
• Calculate the volume in cubic metres.
120 in.
50 in.
100 in.
• 3 ft by 7 ft by 9 in. (nearest tenth of a cubic yard)
Be careful...All lengths need to be in the same unit before calculating area and volume
• Shannon is painting a mural on one wall in her bedroom. The wall measures
10'3" by 8'9".
If each small can of paint is expected to cover 3 m 2. How many cans of
paint will Shannon need to buy? It is recommended to buy 10% extra
material.
Which locker would give more space?
Ch 2 SA and Volume Page 2
Which locker would give more space?
A
B
1.05 m
vs
2'2"
30 cm
40 cm
15 in.
10 in.
By how many cubic metres?
Assignment p61 #1-5,7-11 (#2 find area only)
Ch 2 SA and Volume Page 3