## Tuesday, February 15, 2011

### Karl's Homework Book Post

Homework Book
Even #'s, Pages 78-79.

4.a)

b)

c)

4.a)
V=area of base x height
V=100cm² x 4cm
V=400cm³

b)
V=area of base x height
V=113cm² x 3cm
V=339cm³

c)
V=area of base x height
V=80cm² x 12cm

V=960cm³

6) Which rectangular prism has the larger volume? Show your thinking.
a)

b)

a)

V=area of base x height

V=40cm² x 5cm

V=200cm³

V=area of base x height

V=20cm² x 10cm

V=200cm³

Both of them have a volume 200cm³

b)

V=area of base x height

V=10.5m² x 1m

V=10.5m³

V=area of base x height

V=3m² x 3.5m

V=10.5m³

8)

Nikki and Taylor have to fill the pool this summer. The area of the pool bottom is 27m². The height that the water needs to be is 0.9m. How much water do they need to put in the pool?

V=area of base x height

V=27m² x 0.9m

V=24.3m³

They need to put 24.3m³ of water in the pool.

Cylinder Problems and Volume Problems

a)V=pi.r.r.h

V=(3x2x2)x10

V=120m^3

b)V=pr.r.r.h

V=(3.14x2x2)x10.5

V=131.88m^3

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

V = pi.r.r.h
V = (3.14x4x4)x40
V= 2009.6cm^3

#### 1 comment:

1. Good job Karl. I like how you used pictures to show where the base and height is. Your post was nice and easy to understand. Keep it up!