## Thursday, January 27, 2011

### Homework Book Page 52-55

Questions: #2 on page 54, #4 on page 55 & #6 on page 55.

2) I was asked to find the surface area of this.
A)
My solution is :

lxw= a
3.2x11.5= 36.8cm²
3.2x11.5= 36.8cm²
5x11.5=57.5cm²
5x11.5=57.5cm²
5x3.2=16cm²
5x3.2=16cm²

TSA= (36.8X2)+(57.5X2)+(16X2)
TSA=220.6cm²

B)

My solution:
lxw=a
4.5x10.4=46.8 cm²
4.5x10.4=46.8 cm²
12x10.4=124.8 cm²
12x10.4=124.8 cm²
12x4.5=54 cm²
12x4.5=54 cm²

TSA=(46.8x2)+(124.8x2)+(54x2)
TSA= 451.2 cm²

4) Ty is painting this storage bench for the deck. How much area does he need to paint, to the nearest hundredth of a square meter?

My solution:
lxw=a
0.5x1.56=0.78m²
0.5x1.56=0.78m²
0.38x1.56=0.5928m²
0.38x1.56=0.5928m²
0.5x0.38=0.19m²
0.5x0.38=0.19m²

TSA=(0.78X2)+(0.5928X2)+(0.19x2)
TSA=3.1256m²

6) A)Calculate the amount of material hey need to make a new cover.

My solution:
TSA= 2.992+2.992+0.88+0.88
TSA= 7.744m²

B) Waterproof material at the Fabric Warehouse is on sale this week for \$24.95 per square metre. Calculate the cost to make he new cover.

Solution:
7.774 X 24.95= 193.96
The cost to make a new cover is \$193.96.

VIDEOS!:)

What is a surface area?

What is the total surface of a triangular prism?
* Photos aren't as clear as always. The camera I'm using often isn't available to use.
___________________________
VOLUME PROBLEMS

r=d/2 The maximum volume is 3.925m³
r=0.5/2
r=0.25m

V=π.r.r.h
V= 3.14 x 0.25 x O.25 x 20
V=0.19625m² x 20m
V=3.925m³
____________________
CYLINDER VOLUME

r=d/2 r=d/2
r=1/2 r=0.8/2
r=0.5m r=0.4m

V=π.r.r.h V=π.r.r.h
V=3.14x0.5 x0.5 x 10 V=3.14x0.4 x0.4 x 10
V=0.785m²x 10m V=0.5024m²x 10
V= 7.85m³ V=5.024

7.85m³-5.024m³=2.826m³ The required concrete is 2.826m³ or 2.8m³

VOLUME VIDEO! ENJOY!:)

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6. This comment has been removed by the author.

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