The bases of the cylinder are circles.

Circumference:

-The perimeter of a circle .

Diameter:

- Halfs the circle.

Radius:

- Half of the diatmeter

*Formulas :

Finding the circumference:

πd= c

Finding the diamer :

2r=d or c/π= d

Finding the radius :

d/2= r

*Area of circle:

π x r 2

(3.14 x radius squared)

* Homework questions :)

A= πr

^{2}

A = 314 x 3.2

^{2 A= 3.14 x 10.24 A= 232.15 cm }

^{2 A=}π

^{ r}

^{2 A= 3.14 x 6}

^{2 A= 3.14 x 36 A=113.04cm }

^{2 d/2= r 25/2 = r 25/2= 12.5 A= }π

^{r}

^{2 A=3.14 x 6}

^{2 A= 3.14 x 36 A= 490.526 cm }

^{2 A=}π

^{r}

^{2 A= 3.14 x 16.5 }

^{2 A- 3.14 x 272.25 A= 854.865 cm }

^{2 c/ =d 18.84/ 3.14=d 18.84/ 3.14= 6 d/2= r 6/2= r 6/2= 3 A= }π

^{r}

^{2 A= 3.14x 3}

^{2 A= 3.14 x 9 A= 28.26 cm}

^{2 c/ = d 31.4/ 3.14= d 31.4/3.14= 10 d/2 = r 10/2= r 10/2 = 5 A= }π

^{r}

^{2 A= 3.14 x 5}

^{2 A= 3.14 x 25 A = 78.5 cm}

^{2 d/2 = r 15/2 = r 15/2= 7.5 A= }π

^{r}

^{2 A= 3.14 x 7.5}

^{2}

A= 3.14 x 56.25

A= 176.63 cm2

Cylinder Volume and Volume Problems

a) d/2= r

10/2= 5cm^2

v= (πr^2) * h

v= (3.14 x 5 x 5 ) x 20

V= (78.5) x 20

V= 1570cm^3

b) d/2= r

1/2= o.5m^2

v= (πr^2) x h

v= (3.14 x 0.5 x o.5) x 1

v= (0.785) x 1

v= o.785m^3

c) d/2= r

18/2= 9cm^2

v= (πr^2) x h

v= (3.14 x 9 x 9) x 7.5

v= 254.34 x 7.5

v= 1907.55cm^3

Good job Allison! You included almost all the notes we went over today in class, but you should have included a net of a cylinder. Also, maybe you could have used a little more colour and maybe a video or some links. One thing I would like to point out is the work you showed at the bottom which I didn't clearly understand. Overall though, great job! :)

ReplyDeleteNice post Allison! I like how in the beginning you have big pictures and a good sized font with colour. It was very easy to understand. But, it got a bit squished at the end. Try to make the font bigger and space the the homework questions better. Keep up the good work!

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