Volume Post

Chapter 7.3


a)V=A of BxH
V=78.5cm2x23cm
V=1805.5cm3

A of B= pi x r x r
A of B= 3.14 x 5 x 5
A of B= 78.5cm2

b)V=A of BxH
V=615.44cm2x12cm
V=7385.28cm3

A of B= 78.5cm2
A of B= 3.14 x 14 x 14
A of B= 615.44cm2

c)V=A of BxH
V=0.785m2x1.5m
V=1.1775cm3

A of B= pi x r x r
A of B= 3.14 x 0.5 x 0.5
A of B= 0.785m2

Chapter 7.4



Inner Tube:

r=d/2
r=8/2
r=4cm

V= pi x r x r
V= 3.14 x 4 x 4
V= 2009.6cm3

Outer Tube:

r=d/2
r=10/2
r=5cm

V= pi x r x r
V= 3.14 x 5 x 5
V= 3140cm3

3140cm3 - 2009.6cm3 = 1130.4cm3