## Tuesday, February 15, 2011

### Paul's Textbook post

Show you know pg. 248 and 249
Questions 1,3,7 pg. 250-253

Show you know
pg.248

V=area of base x height

V=40cm² x 22cm

V=880cm³

pg. 249

Left

V=area of base x height
V=24cm² x 7cm

V=168cm³
Right
V=area of base x height
V=56cm² x 3cm
V=168cm³
Both has the same volume

Question 1

In their calculation Charlotte made a mistake measuring the right rectangular prism because she did not use the prism's height.
Instead she should have done this.
V=area of base x height
V=63cm² x 3cm

V=189cm³

Question 3

A)

V=area of base x height
V=15cm² x 4cm
V=60cm³
B)
V=area of base x height

V=18cm² x 4cm
V=216cm³
C)
V=area of base x height
V=96cm² x 20cm
V=1920cm³

Question 7

a)
h=volume divided by area of base
h=32cm³ divided by 8cm²
h=4cm
b)
h=volume divided by area of base
h=35cm³ divided by 5cm²
h=7cm
c)
h=volume divided by area of base
h=36cm³ divided by 9cm²
h=4cm

Here's a link on how to find the volume of a cylinder and a right rectangular prism.

Cylinder

Right rectangular prism

Cylinder Volume and Volume Problems
7.3

Jumbo
r=d/2
r=20/2
r=10cm

v=(π.r.r).h
v=(3.14x10x10)x40
v=314x40
v=12 560cm³

Popcorn Lover's
r=d/2
r=30/2
r=15cm

v=(π.r.r).h
v=(3.14x15x15)x20
v=706.5x20
v=14 130cm³
Martha should choose popcorn lover's conatiner because it has more volume than the jumbo container.

7.4

a)r=d/2
r=120/2
r=60cm

v=(π.r.r).h
v=(3.14x60x60)x18

v=11 304x18
v=203 472cm³

b)v=lxwxh
v=30x22x20
v=13 200cm³

c)volume of wading pool / volume of pail
203 472 / 13 200= 15.4 pails of water

Volume of cylinder

#### 3 comments:

1. Good job Paul! Your post is neat and well organized. Keep up the good work.

2. Good job! It was well organized and consistent with the colors! Keep up the good work!

3. Great job Paul. Your scribe post looks very organized and it was easy to understand. Great job.