Choose 3 questions from pages 54 and 55

2. Calculate the surface area of each rectangular

prism to the nearest tenth of a centimeter squared.

**length x width = a**

**S- 5 x 3.2 = 16 cm2**

- 5 x 3.2 = 16 cm2

F- 11.5 x 5 = 57.5 cm2

- 11.5 x 5 = 57.5 cm2

T- 11.5 x 3.2 = 36.8 cm2

- 11.5 x 3.2 = 36.8 cm2

________________________________

Total Surface Area =220.6 cm2

**length x width = a**

F- 12 x 10.4 = 124.8 cm2

- 12 x 10.4 = 124.8 cm2

T- 10.4 x 4.5 = 46.8 cm2

- 10.4 x 4.5 = 46.8 cm2

S- 12 x 4.5 = 54 cm2

- 12 x 4.5 = 54 cm2

________________________

Total Surface Area = 451.2 cm2

3. Find the surface area of each triangular

prism to the nearest tenth of a meter squared.

**a of a triangle = base x height divided by 2**

**a of rectangle = length x width**

8 x 2.5 = 20 m2

10.6 x 2.5 = 26.5 m2

2.5 x 7m = 17.5 m2

7 x 8 = 56/2 = 28 m2

7 x 8 = 56/2 = 28 m2

___________________

Total Surface Area = 120 m2

**a of a triangle = base x height divided by 2**

**a of rectangle = length x**

**w**

**idth**

**8 x 4.5 = 36 m2**

8 x 4.5 = 36 m2

8 x 6 = 48 m2

6 x 3.35 = 20.1/2 = 10.5

6 x 3.35 = 20.1/2 = 10.5

_____________________

Total Surface Area = 140.1 m2

4. Ty is painting this storage bench for the deck.

How much area does he need to paint, to the nearest

hundredth of a square meter?

**length x w**

**idth**

**=**

**a**

**S- 0.38 x 0.5 = 0.19 m2**

- 0.38 x 0.5 = 0.19 m2

F- 0.5 x 1.56 = 0.78 m2

- 0.5 x 1.56 = 0.78 m2

T- 1.56 x 0.38 = 0.5928 m2

- 1.56 x 0.38 = 0.5928 m2

________________________

= 3.1256 round up...

Total Surface Area = 3.13 m2

Cylinder Volume and Volume Problems

r = d / 2…………………….v = π.r.r.h asdfghjkl;………….502.4m3^ / 2 = 251.2m3^

r = 8 /2……………………..v = (3.14 x 4 x 4) x 10

r = 4m……………………….v = 50.24 m2^ x 10m

…….asdfghjkl;…………….v = 502.4 m3^

r = d / 2.......................v = π.r.r.h

r = 80 / 2……………….v = (3.14 x 40 x 40) x 45

r = 40cm……..….……..v = 5024 cm2^ x 45cm

……………………………..v = 226,080cm3^

……………………………..v = 226,080cm3^

226,080 / 80 = 2826cm2^

2826 / 3.14 = 900cm

√900 = 30cm

30 x 2 = 60cm -diameter

Good job Ana! Your post was very neat and I liked how you showed your work.The pictures also helped. Next time try adding a link and/or video.

ReplyDeleteNice job Ana! You explained your work very clearly. I like how your images are neat and colorful! One thing that I would stay away from are the light/bright font colors, because they're kind of hard to see. Again, Good job!

ReplyDelete