Understanding Triangle Angles

This video tutorial covers the concepts of interior and exterior angles of a triangle. It defines these angles, explains their properties, and demonstrates how to solve problems involving them. The video also discusses theorems related to exterior angles, including the sum of exterior angles and the exterior angle theorem, which states that the sum of the remote interior angles equals the non-adjacent exterior angle. Example problems are provided to illustrate these concepts, and the video concludes with a brief mention of upcoming proofs in subsequent videos.

What are the interior angles of a triangle?

• Angles that are always 90 degrees

• Angles formed by extending the sides

• Angles inside the triangle formed by its sides

• Angles outside the triangle

Tags

CCSS.8.G.A.5

How are exterior angles of a triangle formed?

• By drawing a circle around the triangle

• By extending the sides of the triangle

• By drawing a line parallel to one side

• By bisecting the interior angles

Tags

CCSS.7.G.B.5

If angle 2 is 42 degrees, what is the measure of its linear pair?

• 180 degrees

• 90 degrees

• 138 degrees

• 42 degrees

Tags

CCSS.8.G.A.5

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

• 180 degrees

• 90 degrees

• 360 degrees

• 270 degrees

Tags

CCSS.7.G.B.5

What is the measure of angle 3 if angle 1 is 86 degrees and angle 2 is 42 degrees?

• 52 degrees

• 180 degrees

• 86 degrees

• 42 degrees

What is the sum of the exterior angles of any triangle?

• 180 degrees

• 360 degrees

• 720 degrees

• 540 degrees

Tags

CCSS.8.G.A.5

What are remote angles in a triangle?

• Angles that form a right angle

• Angles that are equal to the exterior angle

• Angles not adjacent to the exterior angle

• Angles adjacent to the exterior angle

Tags

CCSS.8.G.A.5

According to the exterior angle theorem, what is true about the remote interior angles?

• They form a linear pair with the exterior angle

• They are always less than the exterior angle

• Their sum is equal to the non-adjacent exterior angle

• They are equal to the exterior angle

Tags

CCSS.8.G.A.5

If angle 1 is an exterior angle, which angles are its remote interior angles?

• Angles adjacent to angle 1

• Angles not adjacent to angle 1

• Angles equal to angle 1

• Angles forming a linear pair with angle 1

Tags

CCSS.7.G.B.5

What is the relationship between angle 1 and angle 4 if they form a linear pair?

• They are equal

• Their sum is 180 degrees

• Their sum is 360 degrees

• They are complementary

Tags

CCSS.7.G.B.5