Lesson Example Discussion Quiz: Class Homework |
Step-4 |
Title: Surface area of 3D shapes(Cube, cuboid, Cone) |
Grade: 4-a Lesson: S3-L1 |
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 cuboid, which is 15 m long, 10 m broad, and 21 m high. |
|
2 |
Step |
The given values are |
l = 15 m, b = 10 m and h = 21 m |
3 |
Formula |
The total surface area of cuboid is |
\$"Total surface area" = 2(lw + lh + wh)\$ |
4 |
Step |
Now plug the values into the formula |
\$"Total surface area" = 2(15 × 10 + 15 × 21 + 10 × 21)\$ |
5 |
Step |
Simplify the expression: |
Total surface area = 2(150 + 315 + 210) |
6 |
Step |
After make it simpler |
\$"Total surfcae area" = 2(675)\$ |
7 |
Step |
After simplification |
Total surface area = 1350 sq.m |
8 |
Step |
The total surface area of cuboid is 1350 sq.m. |
|
9 |
SumUp |
Can you summarize what you’ve understood in the above steps? |
|
10 |
Choice.A |
The selected option is deemed incorrect as it doesn’t align with the correct answer, resulting in marking it as such |
1503 sq.m |
11 |
Choice.B |
The option is the definitive solution, making it the correct answer for calculating the cuboid’s surface area |
1350 sq.m |
12 |
Choice.C |
The selected option is deemed incorrect as it doesn’t align with the correct answer, resulting in marking it as such |
1530 sq.m |
13 |
Choice.D |
The selected option is deemed incorrect as it doesn’t align with the correct answer, resulting in marking it as such |
1305 sq.m |
14 |
Answer |
Option |
B |
15 |
SumUp |
Can you summarize what you’ve understood in the above steps? |
|
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