External Angles of Triangles

This video tutorial covers Eureka Math Module 2, Lesson 14, focusing on angles of triangles. It builds on concepts from Lesson 13, emphasizing the relationship between interior and exterior angles. The lesson introduces a shortcut for finding exterior angles using remote interior angles. Students are guided through examples and exercises to practice these concepts, with a problem set and exit ticket to assess understanding.

What is the sum of the interior angles of a triangle?

• 360 degrees

• 90 degrees

• 180 degrees

• 270 degrees

Which of the following is true about a straight angle?

• It is 360 degrees

• It is 180 degrees

• It is 90 degrees

• It is 270 degrees

In a triangle, if one external angle is 54 degrees, what is the sum of the two opposite internal angles?

• 180 degrees

• 54 degrees

• 90 degrees

• 126 degrees

What is the shortcut to find an external angle of a triangle?

• Add the adjacent internal angle

• Subtract the adjacent internal angle

• Add the two non-adjacent internal angles

• Subtract the two non-adjacent internal angles

If the internal angles of a triangle are 30 and 60 degrees, what is the external angle adjacent to the 30-degree angle?

• 180 degrees

• 150 degrees

• 120 degrees

• 90 degrees

Which angles are used to find the external angle using the shortcut method?

• Only one internal angle

• All internal angles

• Non-adjacent internal angles

• Adjacent internal angles

In the practice exercises, what is the first step to find the measure of an external angle?

• Identify the two non-adjacent internal angles

• Identify the adjacent internal angle

• Calculate the sum of all angles

• Subtract the internal angles from 360

What should you do if you forget the shortcut method during the problem set?

• Guess the answer

• Refer to the examples

• Skip the question

• Use a calculator

What is the purpose of the exit ticket in this lesson?

• To provide extra credit

• To test your knowledge on unrelated topics

• To practice the concepts learned

• To introduce new concepts

How can you verify your answers for the problem set?

• By checking the online answers

• By using a calculator

• By asking a friend

• By guessing