Exploring Angle Sum and Exterior Angles in Triangles

The video tutorial covers the angle sum and exterior angles of triangles. It explains that the sum of the interior angles of a triangle is always 180 degrees. The tutorial provides examples of finding missing interior angles by subtracting the sum of known angles from 180 degrees. It also discusses exterior angles, explaining that they are supplementary to the adjacent interior angle, and provides examples of calculating exterior angles using this property. The video concludes with practice problems for students to solve.

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

• 270 degrees

• 90 degrees

• 180 degrees

• 360 degrees

Tags

CCSS.8.G.A.5

If a triangle has two angles measuring 100 degrees and 30 degrees, what is the measure of the third angle?

• 50 degrees

• 60 degrees

• 70 degrees

• 80 degrees

Tags

CCSS.8.G.A.5

In a triangle with a right angle and an exterior angle of 140 degrees, what is the measure of the missing interior angle?

• 60 degrees

• 40 degrees

• 30 degrees

• 50 degrees

Tags

CCSS.8.G.A.5

If a triangle has a right angle and one of the other angles is 40 degrees, what is the measure of the third angle?

• 40 degrees

• 30 degrees

• 60 degrees

• 50 degrees

Tags

CCSS.8.G.A.5

What is the measure of an exterior angle if the two opposite interior angles are 82 degrees and 42 degrees?

• 124 degrees

• 126 degrees

• 120 degrees

• 128 degrees

Tags

CCSS.8.G.A.5

If the exterior angle of a triangle is 124 degrees, what is the measure of the opposite interior angle?

• 60 degrees

• 58 degrees

• 56 degrees

• 62 degrees

Tags

CCSS.8.G.A.5

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

• 270 degrees

• 360 degrees

• 180 degrees

• 90 degrees

Tags

CCSS.8.G.A.5

If a triangle has two angles measuring 100 degrees and 30 degrees, what is the measure of the third angle?

• 60 degrees

• 50 degrees

• 80 degrees

• 70 degrees

Tags

CCSS.8.G.A.5

In a triangle with a right angle and an exterior angle of 140 degrees, what is the measure of the missing interior angle?

• 40 degrees

• 50 degrees

• 30 degrees

• 60 degrees

Tags

CCSS.8.G.A.5

If a triangle has a right angle and one of the other angles is 40 degrees, what is the measure of the third angle?

• 30 degrees

• 40 degrees

• 50 degrees

• 60 degrees

Tags

CCSS.8.G.A.5