Lesson Example Discussion Quiz: Class Homework |
Step-2 |
Title: Surface area of 3D shapes(sphere, prism, cylinder) |
Grade: 4-a Lesson: S3-L2 |
Explanation: Hello Students, time to practice and review the steps for the problem. |
Lesson Steps
| Step | Type | Explanation | Answer |
|---|---|---|---|
1 |
Problem |
The rectangular prism has a length of 16 meters and a height of 13 meters. Its surface area is 793 square meters. Find the width of the prism. |
|
2 |
Step |
The given values are |
l = 16 m , A = 793 and h = 13 meters |
3 |
Formula |
The surface are of rectangle prism is |
A = 2(lw + wh + lh) |
4 |
Step |
Substitute given values in the equation |
\$7 = 2(16 times w + w times 13 + 16 times 13)93\$ |
5 |
Step |
After simplification, we get |
16w + 13w + 208 = \$793/2\$ 29w + 208 = 396.5 29w = 188.5 |
6 |
Step |
Move x coefficient to left hand side |
w = \$110.5/29\$ w = 6.5 |
7 |
Step |
Hence the width of a prism is 6.5 meters. |
|
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 result obtained from the calculation using the given dimensions and surface area |
8.5 meters |
10 |
Choice.B |
This is correct because to find the surface area of a rectangular prism, you use the formula |
6.5 meters |
11 |
Choice.C |
This is not correct because it does not match the result obtained from the calculation using the given dimensions and surface area |
95 meters |
12 |
Choice.D |
This is not correct because it does not match the result obtained from the calculation using the given dimensions and surface area |
7.5 meters |
13 |
Answer |
Option |
B |
14 |
SumUp |
Can you summarize what you’ve understood in the above steps? |
|
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