Lesson Example Discussion Quiz: Class Homework |
Step-1 |
Title: Angles(Interior & Exterior) |
Grade: 4-a Lesson: S2-L2 |
Explanation: Hello Students, time to practice and review the steps for the problem. |
Lesson Steps
| Step | Type | Explanation | Answer |
|---|---|---|---|
1 |
Problem |
What is the measure of the exterior angle of the given image? |
|
2 |
Step |
The polygon in the image has |
n = 5 |
3 |
Formula |
we know the interior angle of the polygon is |
\$((n-2) * 180)/n\$ |
4 |
Step |
subsitute the value of n in equation |
\$((5-2) times 180)/5\$ |
5 |
Step |
After simplification |
\$(3 times 180)/5\$ ⇒ \$540/5\$ ⇒ 108 |
6 |
Step |
So the interior angle is 108° |
|
7 |
Clue |
The sum of interior and exterior angles of any polygon is always equal to 180 degrees. |
interior + exterior = 180° |
8 |
Step |
substitute the interior angle value |
108 - exterior = 180 degrees exterior = 180 - 108 |
9 |
Step |
After simplification |
exterior = 72° |
10 |
SumUp |
Can you summarize what you’ve understood in the above steps? |
|
11 |
Choice.A |
This is correct because it match the calculated exterior angle of 72° for the given value of x |
72° |
12 |
Choice.B |
This is not correct because it does not match the calculated exterior angle of 72° for the given value of x |
90° |
13 |
Choice.C |
This is not correct because it does not match the calculated exterior angle of 72° for the given value of x |
45° |
14 |
Choice.D |
This is not correct because it does not match the calculated exterior angle of 72° for the given value of x |
60° |
15 |
Answer |
Option |
A |
16 |
SumUp |
Can you summarize what you’ve understood in the above steps? |
|
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