Lesson Example Discussion Quiz: Class Homework |
Step-1 |
Title: Surface area for Cube & Cylinder |
Grade: 6-a Lesson: S3-L2 |
Explanation: Hello Students, time to practice and review the steps for the problem. |
Lesson Steps
Step | Type | Explanation | Answer |
---|---|---|---|
1 |
Problem |
The diameter of a cylinder is 16 inches and the height of the cylinder is 15 inches. Find the surface area of the cylinder.(pi = 3.14) |
|
2 |
Step |
The given values are |
d = 16 in and h = 15 in |
3 |
Hint |
\$"radius" = "diameter"/2\$ |
⇒ \$r = 16/2\$ |
4 |
Formula |
Area of base is |
\$"Area of base" = π"r"^2\$ |
5 |
Step |
Now plug the values in the formula |
⇒ \$"Area of base" = π(8)^2\$ |
6 |
Step |
Lateral surface area is |
\$"Lateral surface area is" = 2π"rh"\$ |
7 |
Step |
Now plug the values in the formula |
⇒ \$"Lateral surface area is" = 2π times 8 times 15\$ |
8 |
Formula |
Now find for total surface area is |
\$"Total surfacea area" = 2 times "area of base" + "lateral surface area"\$ |
9 |
Step |
Now plug the values in the formula |
\$"Total surfacea area" = 2 times 64π + 240π\$ |
10 |
Step |
After simplification |
Total surface area = 1155.52 sq.in |
11 |
Step |
So, the surface area of the cylinder is 1155.52 sq.in. |
|
12 |
SumUp |
Can you summarize what you’ve understood in the above steps? |
|
13 |
Choice.A |
This is correct because it match the calculated surface area |
1155.52 sq.in |
14 |
Choice.B |
This is incorrect because it doesn’t match the calculated surface area |
1515.52 sq.in |
15 |
Choice.C |
This is incorrect because it doesn’t match the calculated surface area |
1155.25 sq.in |
16 |
Choice.D |
This is incorrect because it doesn’t match the calculated surface area |
1515.25 sq.in |
17 |
Answer |
Option |
A |
18 |
SumUp |
Can you summarize what you’ve understood in the above steps? |
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