Sunday, October 10, 2010

Karra's Scribepost for October 8th

On Friday Backe went over the homework we were supposed to do .

d/2 =r
30/2 = 15
Small Cylinder
2 pi r h
2 pi (15)(40) = 1200 pi

= 3769.91 cm squared


















Big Cylinder

d/2 =r
50/2 = 25
2 pi r h =2 pi (25)(90)
= 4500 pi
= 14137.17 cm squared

Big circle - Small circle
pi r squared -pi r squared
pi 25 squared - pi 15 squared

pi 625 - pi 225 = pi 400
1963.50- 706.86 =
1256.63 cm squared

TSA =3769.91+1256.63+14137.17= 19163.71 cm squared









Nearest hundredth of a meter
Find the surface Area

Large Small
d/2 = r d/2 =r
2.75/2 = 1.38 1/2 = 1

d = 1 m
d = 2.75 cm

2(Big circle - small circle ) Big outside - Small outside
2( pi r squared - pi r squared) 2 pi r h =2 pi r h
2(pi 1.375 squared - pi 0.5 squared ) 2 pi 1.375(5) = 2 pi 0.5 (5)
2(pi 1.89 - pi 0.25) 13.75 pi = 5 pi

2(pi 1.64) 18.75 pi

=3.28 58.90 m squared

10.30 m squared




Circles +outside and inside
TSA = 10.30 + 58.90 =
= 69.20 m squared

HOMEWORK !! WOO :D
Backe's collecting the self evaluation and the Foldable - Surface area formula and symmetry use magazine or draw
Workbook- Vocabulary Link + Chapter Review + Textbook Chapter test only Surface Area
If not getting understanding surface area do extra practice sheet test.





That's ALL the homework :D

& I picckkkk.... RAQUEL to do the next scribe post :D have fun (:


sorry I couldn't make the symbols .

3 comments:

  1. Great scribe post, very informative, well explained, and I like the pictures.

    ReplyDelete
  2. Good scribe post. I like how you explained everything and I like the pictures as well. Also .. darn it karra. why me? Just kidding. anyways, nice scribe post! :)

    ReplyDelete
  3. Good way of explaining everything. Nice pictures and good information. Good scribe post. :)

    ReplyDelete