Lesson Example Discussion Quiz: Class Homework |
Step-2 |
Title: Three-dimensional (3D) shapes |
Grade: 6-a Lesson: S4-L2 |
Explanation: Let us verify the answer here with the steps. |
Lesson Steps Head1
| Step | Type | Explanation | Answer |
|---|---|---|---|
1 |
Problem |
A cylindrical pipe has a radius of 15 in and a total surface area of 915 square in. Calculate the height of the pipe.(π = 3.14). |
|
2 |
Step |
The given values are |
r = 15 ft , surface area = 915 sq.ft |
3 |
Formula |
Total Surface Area is |
\$"s" = 2πr^2 + 2πrh\$ |
4 |
Step |
Now, plug these values into the formula |
\$915 = 2π(15)^2 + 2π(15)"h"\$ |
5 |
Step |
After simplification |
⇒ \$915 = 1413 + 94 "h"\$ ⇒ 94h = 498 ⇒ h = 5.3 ≈ 5 in |
6 |
Step |
Therefore, the height of the pipe is 5 in. |
|
7 |
SumUp |
Can you summarize what you’ve understood in the above steps? |
|
8 |
Choice.A |
This is not the correct answer |
8 in |
9 |
Choice.B |
This is not the correct answer |
3 in |
10 |
Choice.C |
This is not the correct answer |
6 in |
11 |
Choice.D |
This option is correct because it corresponds to the accurate value for the height of the cylindrical pipe |
5 in |
12 |
Answer |
Option |
D |
13 |
SumUp |
Can you summarize what you’ve understood in the above steps? |
|
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