Understanding Angles in Triangles

The video tutorial focuses on solving problems involving parallel lines and triangles. It begins with a classic problem setup, where the goal is to find the measure of a specific angle. The instructor guides through solving the first triangle by using the sum of angles property. Then, the concept of supplementary angles is explained, followed by the exterior angle theorem. Finally, the solution to the second triangle is demonstrated, reinforcing the understanding of angle calculations in geometric figures.

What is the first step in solving a problem involving angles in triangles?

• Determine the sum of all angles

• Calculate the area of the triangle

• Identify the parallel lines

• Find the given angles

Tags

CCSS.8.G.A.5

If two angles in a triangle are 50 and 64 degrees, what is the measure of the third angle?

• 66 degrees

• 70 degrees

• 76 degrees

• 80 degrees

Tags

CCSS.7.G.B.5

What is the relationship between supplementary angles?

• They are complementary

• They add up to 90 degrees

• They are equal

• They add up to 180 degrees

Tags

CCSS.7.G.B.5

If an angle is supplementary to a 66-degree angle, what is its measure?

• 124 degrees

• 120 degrees

• 130 degrees

• 114 degrees

What is an exterior angle in a triangle?

• An angle that is equal to the interior angles

• An angle formed by extending a side of the triangle

• An angle that is less than 90 degrees

• An angle inside the triangle

Tags

CCSS.8.G.A.5

How is an exterior angle related to the remote interior angles?

• It is equal to the sum of the remote interior angles

• It is half of the remote interior angles

• It is double the remote interior angles

• It is unrelated to the remote interior angles

Tags

CCSS.8.G.A.5

If the exterior angle is 114 degrees, what is the sum of the remote interior angles?

• 130 degrees

• 120 degrees

• 114 degrees

• 100 degrees

Tags

CCSS.8.G.A.5

What is the measure of the third angle if the other two angles in a triangle are 114 and 31 degrees?

• 45 degrees

• 35 degrees

• 65 degrees

• 55 degrees

Tags

CCSS.8.G.A.5

What property is used to find the third angle in a triangle?

• Sum of angles in a triangle

• Law of sines

• Law of cosines

• Pythagorean theorem

Tags

CCSS.8.G.A.5

What is the final step in solving for an unknown angle in a triangle?

• Multiply the known angles

• Add the known angles

• Divide the known angles

• Subtract the known angles from 180 degrees

Tags

CCSS.8.G.A.5