30/2 = 15

Small Cylinder

2 pi r h

2 pi (15)(40) = 1200 pi

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 .

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

ReplyDeleteGood 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! :)

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

ReplyDelete