Understanding Triangle Inequalities

The video tutorial on MooMooMath explains triangle inequalities, focusing on how the sides of a triangle must relate to each other to form a valid triangle. Using straws of different lengths, the instructor demonstrates which combinations can form triangles and which cannot. The key rule is that the sum of the lengths of the two shorter sides must be greater than or equal to the length of the longest side. Several examples are provided to illustrate this rule, and the video concludes with a summary of the key points discussed.

What is the main topic discussed in the video?

• Triangle Inequalities

• Rectangle Perimeters

• Circle Properties

• Square Areas

What materials are used to demonstrate triangle formation?

• Rulers

• Straws

• Sticks

• Ropes

Tags

CCSS.7.G.A.2

Which combination of straw lengths can form a triangle?

• 8, 4, and 2

• 8, 6, and 2

• 8, 6, and 4

• 6, 2, and 2

Tags

CCSS.7.G.A.2

Why can't the combination of 8, 6, and 2 form a triangle?

• The sum of the two shorter sides is not greater than the longest side

• The sides are equal

• The sides are too long

• The sides are too short

What is the rule for creating triangles?

• The longest side must be equal to the sum of the other two sides

• The two shorter sides must add up to or be greater than the longest side

• All sides must be equal

• The longest side must be greater than the sum of the other two sides

In the example with sides 2, 4, and 5, why does it form a triangle?

• The sides are all different

• The sides are all equal

• The sum of 2 and 4 is greater than 5

• The longest side is less than the sum of the other two

Which of the following is NOT a valid triangle inequality?

• b + c > a

• a + b < c

• a + c > b

• a + b > c

What happens if the sum of the two shorter sides is equal to the longest side?

• It forms a triangle

• It does not form a triangle

• It forms a right triangle

• It forms an isosceles triangle

Tags

CCSS.7.G.A.2

Which combination of sides will form a triangle?

• 3, 4, 8

• 7, 10, 5

• 5, 5, 10

• 2, 2, 5

What is the key takeaway from the video?

• Triangles can be formed with any three sides

• The longest side must be the sum of the other two sides

• The sum of the two shorter sides must be greater than or equal to the longest side

• All sides must be equal to form a triangle