Lesson Example Discussion Quiz: Class Homework |
Step-1 |
Title: Area of Triangle(Based on Sides) |
Grade: 4-a Lesson: S2-L5 |
Explanation: Hello Students, time to practice and review the steps for the problem. |
Lesson Steps
| Step | Type | Explanation | Answer |
|---|---|---|---|
1 |
Problem |
A triangle with side lengths a = 8, b = 15, and c = 17 units. Calculate the area. |
|
2 |
Step |
The given values are |
a = 8 , b = 15 and c = 17 units |
3 |
Formula |
The semi perimeter of the triangle |
\$S = (a + b + c) / 2 \$ |
4 |
Step |
Substitute the value in the formula |
\$S = (8 + 15 + 17) / 2\$ |
5 |
Step |
After simplification |
S = 20 units |
6 |
Formula |
Use Heron’s formula to find the area |
\$A = \sqrt (s( s-a) (s-b) (s-c))\$ |
7 |
Step |
Substitute the value in the formula |
\$A = \sqrt (20( 20-8) (20-15) (20-17))\$ |
8 |
Step |
After simplification |
\$\sqrt (20 times 12 times 5 times 3)\$ |
9 |
Step |
After simplification |
\$A = \sqrt 3600\$ |
10 |
Step |
After simplification |
A = 60 sq.units |
11 |
Step |
The area of the triangle is 60 sq.units. |
|
12 |
SumUp |
Can you summarize what you’ve understood in the above steps? |
|
13 |
Choice.A |
This is correct based on the calculation using Heron’s formula for this specific triangle |
60 sq.units |
14 |
Choice.B |
This is not correct based on the calculation using Heron’s formula for this specific triangle |
58 sq.units |
15 |
Choice.C |
The value 20sq. units does not match the correct calculation using Heron’s formula for this specific triangle |
20 sq.units |
16 |
Choice.D |
This is not correct based on the calculation using Heron’s formula for this specific triangle |
24 sq.units |
17 |
Answer |
Option |
A |
18 |
SumUp |
Can you summarize what you’ve understood in the above steps? |
|
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