Angle Explorers: Measuring Turns with Degrees!

Mathematics Grades 4th Grade 9:17 Video
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Lesson Description

Join us on an adventure to learn all about angles and how we measure them using degrees. We'll discover different types of angles and how to use a protractor!

Video Resource

Math Antics - Angles & Degrees

mathantics

Duration: 9:17
Watch on YouTube

Key Concepts

  • Angles are measured in degrees.
  • A degree is a unit of rotation.
  • Different types of angles: acute, right, obtuse, straight.
  • Using a protractor to measure angles.
  • Complementary and Supplementary Angles

Learning Objectives

  • Students will be able to define an angle and a degree.
  • Students will be able to identify acute, right, obtuse, and straight angles.
  • Students will be able to measure angles using a protractor.
  • Students will be able to solve problems involving complementary and supplementary angles.

Educator Instructions

  • Introduction (5 mins)
    Begin by asking students what they know about angles. Show them different examples of angles in the classroom (corners of the desk, the opening of a book, etc.). Introduce the idea that angles are a measure of rotation and are measured in degrees. Mention the video and that it will teach all about angles.
  • Video Viewing (10 mins)
    Play the Math Antics - Angles & Degrees video. Encourage students to pay close attention to the different types of angles and how they are measured.
  • Discussion and Review (10 mins)
    After the video, discuss the key concepts. Review the different types of angles (acute, right, obtuse, straight) and their degree measurements. Emphasize the importance of memorizing that a right angle is 90 degrees and a straight angle is 180 degrees.
  • Protractor Practice (15 mins)
    Distribute protractors to each student. Provide worksheets with various angles for them to measure. Walk around the classroom to provide assistance and ensure they are using the protractor correctly. Remind students of the proper placement of the protractor (axis point on the vertex, one ray aligned with the baseline).
  • Problem Solving (10 mins)
    Present word problems involving complementary and supplementary angles. Guide students through the process of using addition or subtraction to find the missing angle measurements. For example: 'Angle A and Angle B are complementary angles. Angle A measures 30 degrees. What is the measure of Angle B?'
  • Quiz Time! (10 mins)
    Hand out both the Multiple Choice and Fill in the Blank quiz to students for assessment.

Interactive Exercises

  • Angle Scavenger Hunt
    Have students search the classroom for examples of acute, right, and obtuse angles. They should draw a picture of each angle they find and label its type.
  • Angle Art
    Students create a picture using only straight lines, forming different types of angles. They then measure each angle they created using a protractor and label it.

Discussion Questions

  • What is an angle?
  • What is a degree?
  • What are the different types of angles we learned about, and what are their degree ranges?
  • How do you use a protractor to measure an angle?
  • What are complementary and supplementary angles?

Skills Developed

  • Measurement skills
  • Angle identification
  • Problem-solving
  • Critical thinking

Multiple Choice Questions

Question 1:

What unit do we use to measure angles?

Correct Answer: Degrees

Question 2:

What is an angle called that is less than 90 degrees?

Correct Answer: Acute

Question 3:

How many degrees are in a right angle?

Correct Answer: 90 degrees

Question 4:

How many degrees are in a straight angle?

Correct Answer: 180 degrees

Question 5:

What tool do we use to measure angles?

Correct Answer: Protractor

Question 6:

An angle that is greater than 90 degrees but less than 180 degrees is called a(n) ______ angle.

Correct Answer: Obtuse

Question 7:

Two angles that add up to 90 degrees are called ______ angles.

Correct Answer: Complementary

Question 8:

Two angles that add up to 180 degrees are called ______ angles.

Correct Answer: Supplementary

Question 9:

A full circle has how many degrees?

Correct Answer: 360 degrees

Question 10:

Which of these angles is the biggest?

Correct Answer: 120 degrees

Fill in the Blank Questions

Question 1:

Angles are measured in __________.

Correct Answer: degrees

Question 2:

An angle that is less than 90 degrees is an __________ angle.

Correct Answer: acute

Question 3:

A right angle measures __________ degrees.

Correct Answer: 90

Question 4:

A straight angle measures __________ degrees.

Correct Answer: 180

Question 5:

We use a __________ to measure angles.

Correct Answer: protractor

Question 6:

An angle greater than 90 degrees but less than 180 degrees is called an __________ angle.

Correct Answer: obtuse

Question 7:

__________ angles add up to 90 degrees.

Correct Answer: Complementary

Question 8:

__________ angles add up to 180 degrees.

Correct Answer: Supplementary

Question 9:

A full circle is ________ degrees

Correct Answer: 360

Question 10:

An example of a real-world right angle could be the corner of a __________

Correct Answer: book

Educational Standards

4.GM.1.1:Identify points, lines, line segments, rays, angles, endpoints, and parallel and perpendicular lines in various models. 4.GM.2.1:Measure angles in geometric figures and real-world objects with a protractor or angle ruler.

Teaching Materials

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