Lesson Example Discussion Quiz: Class Homework |
Step-2 |
Title: Area of 2D-Shapes |
Grade: 6-a Lesson: S4-L1 |
Explanation: Let us verify the answer here with the steps. |
Lesson Steps Head1
| Step | Type | Explanation | Answer |
|---|---|---|---|
1 |
Problem |
The width of the rectangle is 20 m, and its diagonal is 29 m. Find the area of the rectangle. |
|
2 |
Step |
The given values are |
B = 20 m and diagonal = 29 m |
3 |
Formula |
Using Pythagorean theorem |
\$"Diagonal"^2 = "width"^2 + "length"^2\$ |
4 |
Step |
Now substitute the values in the formula |
\$29^2 = 20^2 + "l"^2\$ |
5 |
Step |
After simplification |
\$841 = 400 + "l"^2\$ |
6 |
Step |
Now subtract the values |
\$"l"^2 = 841 - 400\$ |
7 |
Step |
After simplification |
\$"l"^2 = 441\$ |
8 |
Step |
After simplification |
l = 21 m |
9 |
Formula |
Area of rectangle is |
\$Area = "length" times "width"\$ |
10 |
Step |
Now substitute the values in the area formula |
\$ "A" = 21 times 20\$ |
11 |
Step |
After simplification |
A = 420 sq.m |
12 |
Step |
The area of a triangle is 420 sq.m. |
|
13 |
SumUp |
Can you summarize what you’ve understood in the above steps? |
|
14 |
Choice.A |
This is incorrect. It does not accurately calculates the area by using the formula |
240 sq.m |
15 |
Choice.B |
This is correct. It accurately calculates the area by using the formula |
420 sq.m |
16 |
Choice.C |
This is incorrect. It does not accurately calculates the area by using the formula |
204 sq.m |
17 |
Choice.D |
This is incorrect. It does not accurately calculates the area by using the formula |
402 sq.m |
18 |
Answer |
Option |
B |
19 |
SumUp |
Can you summarize what you’ve understood in the above steps? |
|
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