Journal Question:
1. 49
2. 12 8 ?
Volume
Rectangular Prism:
Kleenex Box
Cereal Box
Formula:
V=lwh This means length x width x
height
Examples:
Find the Volume using V=lwh
#1. 22in.
6in.
5in.
V=lwh
V=22x5x6
V= 660in3
More Practice:
#2. 20ft. #3. 10yd.
3ft.
5ft.
V=lwh V=lwh
V=20x5x3 V=10x10x10
V=300ft3 V=1,000yd3
Volume
Cylinders:
Soup Can
Coffee Can
Formula:
V=
r h
2
Why πr2h?
πr2 is the area of a circle for the floor of the
cylinder, then we multiply it times the height
Volume of Cylinders:
Find the volume of the cylinders using
V=πr2h
#1. r = 4in. h=10in. #2. r = 2in. h=20in.
V= π(42)(10) V=π(22)(20)
V= π(16)(10) V= π(4)(20)
V=π(160) in3 V= π(80) in3
More Practice:
Find the volume. Use 3.14 for pi.
#3. r = 6ft. h= 30ft.
V= πr2h
V= 3.14(62)(30)
V= 3.14 x 36 x 30
V= 3391.2 ft3
Homework:
Workbook pg. #