Lesson Example Discussion Quiz: Class Homework |
Step-5 |
Title: Area of 3D shapes |
Grade: 1300-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 |
Find the total surface area of a container in a cylindrical shape whose diameter is 26 cm and height is 18 cm. Use value π is 3.14 |
|
2 |
Step |
Given diameter is height(h) is |
26 cm 18 cm |
3 |
Formula: |
Radius(r) of the cylinder |
\$r = ("diameter")/2\$ |
4 |
Step |
Substitute the value |
\$r = 26/2 \$ \$r = 13cm\$ |
5 |
Formula: |
Area of the cylinder |
\$A = 2πr(h + r)\$ |
6 |
Step |
Substitute the value |
\$A = 2 times 3.14 times 13(18 + 13)\$ \$A = 2 \times 3.14 \times 13(31)\$ \$A = 2530.84\$ |
7 |
Step |
So, the total surface area of the cylindrical container is \$2530.84\$ sq.cm. |
|
8 |
SumUp |
Can you summarize what you’ve understood in the above steps? |
|
9 |
Choice.A |
This is an incorrect option; it’s less than the correct value |
\$2515\$ sq.cm |
10 |
Choice.B |
This is an incorrect option; it’s greater than the correct value |
\$2533\$ sq.cm |
11 |
Choice.C |
This is correct; it matches the calculated value |
\$2530.84\$ sq.cm |
12 |
Choice.D |
This is an incorrect option; it’s greater than the correct value |
\$2532\$ sq.cm |
13 |
Answer |
Option |
C |
14 |
SumUp |
Can you summarize what you’ve understood in the above steps? |
|
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