Exploring Interior Angles of Triangles

This video tutorial covers the concept of interior angles in triangles, explaining that the sum of these angles is always 180 degrees. It includes a proof of the Triangle Sum Theorem using transversals and parallel lines. The tutorial also demonstrates how to solve for missing angles in triangles through example problems and equations. The lesson concludes with a summary of the key points discussed.

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

• 270 degrees

• 180 degrees

• 360 degrees

• 90 degrees

Tags

CCSS.8.G.A.5

What tool can you use to measure the angles of a triangle?

• Compass

• Ruler

• Protractor

• Calculator

Tags

CCSS.4.MD.C.6

What is a proof in Geometry?

• A guess

• A bunch of facts and explanations

• A measurement tool

• A type of triangle

What are alternate interior angles?

• Angles that are on the same side of the transversal and outside the parallel lines

• Angles that are on the same side of the transversal

• Angles that are on opposite sides of the transversal and inside the parallel lines

• Angles that are outside the parallel lines

Tags

CCSS.8.G.A.5

If angle 1 is 62 degrees and angle 3 is 35 degrees, what is angle 2?

• 45 degrees

• 83 degrees

• 62 degrees

• 35 degrees

Tags

CCSS.7.G.B.5

What is the first step in solving for a missing angle in a triangle?

• Guess the angle

• Use a calculator

• Set up an equation

• Measure the angle

Tags

CCSS.8.G.A.5

What is the measure of angle A if 5x + 5 and x = 10?

• 60 degrees

• 55 degrees

• 65 degrees

• 50 degrees

Tags

CCSS.7.G.B.5

What is the measure of angle C if 3x + 5 and x = 10?

• 35 degrees

• 40 degrees

• 30 degrees

• 25 degrees

Tags

CCSS.7.G.B.5

What is the sum of the angles in any given triangle?

• 90 degrees

• 180 degrees

• 270 degrees

• 360 degrees

Tags

CCSS.8.G.A.5

What should you do if you want to check your work on finding the angles of a triangle?

• Use a different method

• Guess the angles

• Measure the angles again

• Add up all three angles to see if they equal 180 degrees

Tags

CCSS.8.G.A.5