Lesson Example Discussion Quiz: Class Homework |
Step-3 |
Title: Volume of 3d-shapes(cone , cylinder) |
Grade: 4-a Lesson: S3-L4 |
Explanation: Hello Students, time to practice and review the steps for the problem. |
Lesson Steps
| Step | Type | Explanation | Answer |
|---|---|---|---|
1 |
Problem |
If the height of a given cone is 9 cm and the diameter of the circular base is 11 cm. Then, find its volume ( π = 3.141). |
|
2 |
Step |
The given values are |
h = 9 cm and d = 11 cm ( π = 3.141) |
3 |
Formula |
To find the volume (V) of a cone, you can use the formula: |
\$V = 1/3 times π times r^2 times h\$ |
4 |
Step |
The diameter (d) is twice the radius (r) |
⇒ \$r = d/2\$ ⇒ \$ r = 11/2 \$ ⇒ r = 5.5 cm |
5 |
Step |
Now plug the values into the formula |
\$ V = 1/3 times 3.141 times (5.5)^2 times 9\$ |
6 |
Step |
After simplification |
⇒ \$ V = 1/3 times 3.141 times 30.25 times 9\$ ⇒ \$V = 1/3 times 855.137\$ ⇒ V = 285.045 cu.cm |
7 |
Step |
Therefore, the volume of the given cone is approximately V = 285.045 cu.cm |
|
8 |
SumUp |
Can you summarize what you’ve understood in the above steps? |
|
9 |
Choice.A |
This is not correct because it does not match the calculated volume |
258.45 cu.cm |
10 |
Choice.B |
This is correct because it match the calculated volume |
285.045 cu.cm |
11 |
Choice.C |
This is not correct because it does not match the calculated volume |
258.045 cu.cm |
12 |
Choice.D |
This is not correct because it does not match the calculated volume |
248.45 cu.cm |
13 |
Answer |
Option |
B |
14 |
SumUp |
Can you summarize what you’ve understood in the above steps? |
|
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