Lesson Example Discussion Quiz: Class Homework |
Step-3 |
Title: Surface area of 3D shapes(sphere, prism, cylinder) |
Grade: 4-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 radius of a cylinder is 9 inches and the height of the cylinder is 13 inches. Find the surface area of the cylinder. (Take the value of pi as 3.14) |
|
2 |
Step |
The given values are |
r = 9 in and h = 13 in pi = 3.14 |
3 |
Formula |
The surface area of cylinder is |
\$ A = 2πr^2 + 2πrh\$ |
4 |
Step |
Now plug the values into the formula |
\$A = 2 times 3.14 times (9)^2 + 2 times 3.14 times 9 times 13\$ |
5 |
Step |
After simplification |
A = 508.68 + 734.76 |
6 |
Step |
After simplification |
A = 1243.44 sq.in |
7 |
Step |
The surface area of a cylinder is 1243.44 sq.in. |
|
8 |
SumUp |
Can you summarize what you’ve understood in the above steps? |
|
9 |
Choice.A |
This is not correct because it only calculates the lateral surface area |
1234 sq.in |
10 |
Choice.B |
This is not correct because it only calculates the lateral surface area |
1243 sq.in |
11 |
Choice.C |
This is not correct because it only calculates the lateral surface area |
1234.44 sq.in |
12 |
Choice.D |
This is correct because it correctly calculates the surface area of the cylinder using the formula |
1243.44 sq.in |
13 |
Answer |
Option |
D |
14 |
SumUp |
Can you summarize what you’ve understood in the above steps? |
|
Copyright © 2020-2024 saibook.us Contact: info@saibook.us Version: 1.5 Built: 09-January-2023 08:10 PM EST