Lesson Example Discussion Quiz: Class Homework |
Step-4 |
Title: Area of 3D shapes |
Grade: 1400-a Lesson: S3-L6 |
Explanation: Hello Students, time to practice and review the steps for the problem. |
Lesson Steps
| Step | Type | Explanation | Answer |
|---|---|---|---|
1 |
Problem |
Calculate the curved surface area of a sphere having a radius of 2 cm. Use pi = 3.14 |
|
2 |
Step |
Given that the radius (r) of the sphere is |
2 cm |
3 |
Hint |
π (pi) is a constant approximately equal to 3.14. |
|
4 |
Formula: |
Curved Surface Area(A) |
\$A = 4 \times\ π \r^2\$ |
5 |
Step |
Substitute the values into the formula |
\$A = 4 \times\ 3.14 \(2)^2\$ \$A = 4 \times 3.14 \times 4\$ \$A = 50.24\$ |
6 |
Step |
So, the curved surface area of the sphere with a radius of 2 cm (using pi = 3.14) is \$50.24\$ sq.units. |
|
7 |
SumUp |
Can you summarize what you’ve understood in the above steps? |
|
8 |
Choice.A |
This option is incorrect. Its value is significantly smaller than the correct option |
\$5.26\$ sq.units |
9 |
Choice.B |
This option is incorrect. Its value is significantly larger than the correct option |
\$52.26\$ sq.units |
10 |
Choice.C |
It is the correct option for a 2 cm radius sphere’s curved surface area |
\$50.24\$ sq.units |
11 |
Choice.D |
This is incorrect because it’s larger than the correct value |
\$15.26\$ sq.units |
12 |
Answer |
Option |
C |
13 |
SumUp |
Can you summarize what you’ve understood in the above steps? |
|
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