Exploring the Triangle Angle Sum Theorem

This video tutorial covers the Triangle Angle Sum Theorem, demonstrating how to measure angles in a triangle using a protractor. It explains that the sum of the angles in any triangle is always 180 degrees. The video includes examples of finding unknown angles in triangles by using the theorem, and emphasizes checking work by adding angles to ensure they total 180 degrees. The tutorial concludes with a recap of the theorem and problem-solving techniques.

What is the main topic discussed in this video?

• Triangle Angle Sum Theorem

• Pythagorean Theorem

• Quadrilateral Angle Sum Theorem

• Circle Theorem

What tool is used to measure the angles in the triangle?

• Calculator

• Protractor

• Compass

• Ruler

Tags

CCSS.4.MD.C.6

What is the sum of the angles in any triangle?

• 90 degrees

• 180 degrees

• 270 degrees

• 360 degrees

Tags

CCSS.8.G.A.5

If two angles in a triangle are 65 degrees and 57 degrees, what is the measure of the third angle?

• 58 degrees

• 64 degrees

• 60 degrees

• 62 degrees

Tags

CCSS.8.G.A.5

How can you verify your solution when finding the third angle in a triangle?

• Subtract the angles from 360 degrees

• Multiply all three angles

• Divide the sum of the angles by 2

• Add all three angles to check if they sum to 180 degrees

Tags

CCSS.8.G.A.5

In the second example, if the two given angles are 130 degrees and 20 degrees, what is the measure of the third angle?

• 50 degrees

• 20 degrees

• 30 degrees

• 40 degrees

Tags

CCSS.7.G.B.5

What does a right angle represent in degrees?

• 45 degrees

• 120 degrees

• 60 degrees

• 90 degrees

Tags

CCSS.4.G.A.1

In the third example, if one angle is 40 degrees and the other is a right angle, what is the measure of the third angle?

• 60 degrees

• 50 degrees

• 40 degrees

• 70 degrees

Tags

CCSS.7.G.B.5

What should you do to check your work after finding the third angle in a triangle?

• Add all three angles to see if they sum to 180 degrees

• Subtract the angles from 360 degrees

• Multiply the angles together

• Divide the sum of the angles by 3

Tags

CCSS.8.G.A.5

What is the key takeaway from the triangle angle sum theorem?

• The sum of the three angles in any triangle will always be 270 degrees

• The sum of the three angles in any triangle will always be 360 degrees

• The sum of the three angles in any triangle will always be 90 degrees

• The sum of the three angles in any triangle will always be 180 degrees

Tags

CCSS.8.G.A.5