Exploring the Triangle Angle Sum Theorem

The video tutorial explains the Triangle Sum Theorem, which states that the sum of the interior angles of a triangle is 180 degrees. The instructor begins by discussing the properties of a straight angle, which measures 180 degrees. A triangle is then constructed, and its angles are torn apart and aligned along a straight line to visually demonstrate that they sum to 180 degrees, thus proving the theorem.

What is another name for the Triangle Sum Theorem?

• Triangle Side Theorem

• Triangle Area Theorem

• Triangle Angle Sum Theorem

• Triangle Perimeter Theorem

Tags

CCSS.8.G.A.5

What is the total degree measure of a straight line?

• 90 degrees

• 180 degrees

• 270 degrees

• 360 degrees

Tags

CCSS.4.MD.C.5B

CCSS.HSG.CO.A.1

What is the degree measure of a straight angle?

• 270 degrees

• 360 degrees

• 180 degrees

• 90 degrees

Tags

CCSS.4.MD.C.5B

CCSS.HSG.CO.A.1

What type of triangle did the teacher draw?

• Equilateral triangle

• Isosceles triangle

• Scalene triangle

• Right triangle

Tags

CCSS.4.G.A.2

What is the purpose of cutting out the triangle?

• To measure its sides

• To prove the angles add up to 180 degrees

• To find its area

• To calculate its perimeter

Tags

CCSS.6.G.A.4

How many angles does a triangle have?

• Four

• Five

• Three

• Two

Tags

CCSS.2.G.A.1

What is the first step in proving the Triangle Sum Theorem?

• Measuring the angles

• Drawing a straight line

• Cutting out the triangle

• Drawing a circle

Tags

CCSS.8.G.A.5

What should the sum of the angles on one side of a straight line be?

• 90 degrees

• 360 degrees

• 180 degrees

• 270 degrees

Tags

CCSS.7.G.B.5

What happens when the triangle's angles are placed next to a straight line?

• They overlap

• They form a circle

• They take up all the space on one side of the line

• They form a square

Tags

CCSS.4.MD.C.5B

CCSS.HSG.CO.A.1

What does the Triangle Sum Theorem state?

• The angles of a triangle add up to 180 degrees

• The perimeter of a triangle is 180 degrees

• The area of a triangle is 180 degrees

• The sides of a triangle add up to 180 degrees

Tags

CCSS.8.G.A.5