Lesson Example Discussion Quiz: Class Homework |
Step-4 |
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 |
What will be the surface area of the triangular prism if the base and height of a triangular prism are 10 cm and 18 cm, respectively, along with the height of the equilateral triangular bases being 19 cm? |
|
2 |
Step |
The given values are |
a = b = c = 10 cm, h = 18 cm and equilateral triangle base (H) = 19 cm |
3 |
Formula |
The surface area of triangular prism |
\$A = bh + ( a + b + c) H\$ |
4 |
Step |
Now plug the values into the formula |
\$A = 10 times 18 + ( 10 + 10 + 10 ) times 19\$ |
5 |
Step |
After make it simpler |
\$A = 180 + (30 times 19)\$ |
6 |
Step |
After make it simpler |
A = 180 + 570 |
7 |
Step |
After simplification |
A = 750 sq.cm |
8 |
Step |
The surface area of a triangular prism is 750 sq.cm. |
|
9 |
SumUp |
Can you summarize what you’ve understood in the above steps? |
|
10 |
Choice.A |
This is incorrect because it does not accurately calculate the surface area of a triangular prism based on the given dimensions and the formula |
705 sq.cm |
11 |
Choice.B |
This is incorrect because it does not accurately calculate the surface area of a triangular prism based on the given dimensions and the formula |
507 sq.cm |
12 |
Choice.C |
This is incorrect because it does not accurately calculate the surface area of a triangular prism based on the given dimensions and the formula |
750 sq.cm |
13 |
Choice.D |
This is correct because the formula for the surface area of a triangular prism |
570 sq.cm |
14 |
Answer |
Option |
D |
15 |
SumUp |
Can you summarize what you’ve understood in the above steps? |
|
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