Candy tube A:

d/2 = r

7/2 = r

3.5 cm = r

TSA= (2 x Pi x r x r)+(2 x r x Pi x h)

TSA= (2 x 3.14 x 3.5 x 3.5)+(2 x 3.5 x 3.14 x 122)

TSA= (76.93cm2)+(2681.56cm2)

TSA= 2758cm2

The amount of plastic needed to make tube A is 2758cm2.

Candy tube B:

d/2 = r

11/2 = r

5.5 cm = r

TSA= (2 x Pi x r x r)+(2 x r x Pi x h)

TSA= (2 x 3.14 x 5.5 x 5.5)+(2 x 5.5 x 3.14 x 85)

TSA= (189.97cm2)+(2935.9cm2)

TSA= 3125.87cm2

The amount of plastic needed to make tube B is 3125.87cm2.

Paper towel is rolled around a cardboard tube. Calcula

te the outside surface area of the tube.

**Question 2:**

d/2=r10/2=r5cm=r

v=(pir^2)hv=(3.14x5x5)40v=78.5cm^2x40cm v=3140cm^3

d/2=r8/2=r4cm=r

v=(pir^2)hv=(3.14x4x4)40v=50.24cm^2x40cmv=2009.6cm^3

3140cm^3 - 2009.6cm^3=1130.4cm^3

Good job Marysa! I like how your post is easy to read. Your work was clear and easy to understand. Next time, add more color, videos, and links.

ReplyDeleteGreat job Marysa! I like how your post is very organized. The picture that you put really popped out. Next time you might want to include a video and/or link.

ReplyDeleteGood job Marysa! I like how your post is so neat! I really like your picture! Next time you should try to add a video if you can so other classmates in grade eight can understand..Other then that your post was really great!

ReplyDelete