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The video explains essential facts about triangles: the sum of all angles is 180 degrees, a triangle cannot have more than one obtuse or right angle, and the sum of the lengths of any two sides must be greater than the length of the third side.

What is the total sum of all angles in a triangle?

• 270 degrees

• 360 degrees

• 180 degrees

• 90 degrees

Why can't a triangle have more than one obtuse angle?

• Because obtuse angles are equal to 90 degrees

• Because obtuse angles are not allowed in triangles

• Because obtuse angles are less than 90 degrees

• Because the sum of two obtuse angles exceeds 180 degrees

What happens if a triangle has two right angles?

• The triangle remains unchanged

• The triangle becomes a circle

• The third angle becomes zero, which is impossible

• The triangle becomes a square

What is the sum of two right angles?

• 45 degrees

• 90 degrees

• 180 degrees

• 270 degrees

According to the triangle inequality theorem, what must be true about the sides of a triangle?

• The sum of any two sides must be twice the third side

• The sum of any two sides must be greater than the third side

• The sum of any two sides must be equal to the third side

• The sum of any two sides must be less than the third side