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Title: Angle(Types of angles)

Grade: 4-a Lesson: S2-L1

Explanation: Hello Students, time to practice and review the steps for the problem.

Lesson Steps

Step	Type	Explanation	Answer
1	Problem	If an acute angle measures 30°, write the value of its corresponding reflex angle.
2	Step	A reflex angle is an angle that measures more than 180° but less than 360°.
3	Step	Reflex Angle = 360° - Acute Angle
4	Step	The given acute angle is	30°
5	Step	Reflex Angle is	360° - 30° ⇒ 330°
6	Step	So, the corresponding reflex angle for an acute angle measuring 30° is 330°.
7	SumUp	Can you summarize what you’ve understood in the above steps?
8	Choice.A	This is not correct because it does not satisfy the relationship with the acute angle, which is 360 − 30 = 330	310 degrees
9	Choice.B	This is correct because it correctly represents the value of the corresponding reflex angle for an acute angle measuring 30 degrees	330 degrees
10	Choice.C	This is not correct for the same reason. The reflex angle corresponding to a 30 degrees acute angle is 360 − 30 = 330	300 degrees
11	Choice.D	360 degrees is not correct because 360 degrees is a full circle, and the reflex angle is specifically the portion beyond 180 degrees	360 degrees
12	Answer	Option	B
13	SumUp	Can you summarize what you’ve understood in the above steps?

Step

Type

Explanation

Answer

Problem

If an acute angle measures 30°, write the value of its corresponding reflex angle.

Step

A reflex angle is an angle that measures more than 180° but less than 360°.

Step

Reflex Angle = 360° - Acute Angle

Step

The given acute angle is

30°

Step

Reflex Angle is

360° - 30°

⇒ 330°

Step

So, the corresponding reflex angle for an acute angle measuring 30° is 330°.

SumUp

Can you summarize what you’ve understood in the above steps?

Choice.A

This is not correct because it does not satisfy the relationship with the acute angle, which is 360 − 30 = 330

310 degrees

Choice.B

This is correct because it correctly represents the value of the corresponding reflex angle for an acute angle measuring 30 degrees

330 degrees

Choice.C

This is not correct for the same reason. The reflex angle corresponding to a 30 degrees acute angle is 360 − 30 = 330

300 degrees

Choice.D

360 degrees is not correct because 360 degrees is a full circle, and the reflex angle is specifically the portion beyond 180 degrees

360 degrees

Answer

Option

SumUp

Can you summarize what you’ve understood in the above steps?