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= πr2
A = 314 x 3.2 2
A= 3.14 x 10.24
A= 232.15 cm 2
A=π r2
A= 3.14 x 62
A= 3.14 x 36
A=113.04cm 2
d/2= r
25/2 = r
25/2= 12.5
A= πr2
A=3.14 x 62
A= 3.14 x 36
A= 490.526 cm 2
A=πr2
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= πr2
A= 3.14x 32
A= 3.14 x 9
A= 28.26 cm2
c/ = d
31.4/ 3.14= d
31.4/3.14= 10
d/2 = r
10/2= r
10/2 = 5
A= πr2
A= 3.14 x 52
A= 3.14 x 25
A = 78.5 cm2
d/2 = r
15/2 = r
15/2= 7.5
A= πr2
A= 3.14 x 7.52
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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