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

• 90 degrees

• 180 degrees

• 270 degrees

• 360 degrees

How can the sum of the angles in a triangle be visually demonstrated using cut-out pieces?

• By stacking the angles on top of each other.

• By arranging the angles to form a complete circle.

• By placing the angles adjacent to each other to form a straight line.

• By measuring each angle with a protractor and adding them up.

Which geometric property is used in the formal proof to show that the sum of angles in a triangle is 180 degrees?

• Corresponding angles formed by parallel lines.

• Vertical angles.

• Alternate interior angles formed by parallel lines.

• Angles on a straight line.

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What defines an acute triangle?

• It has one angle greater than 90 degrees.

• It has one angle equal to 90 degrees.

• All three of its angles are less than 90 degrees.

• It has at least two angles greater than 90 degrees.

What is the relationship between an exterior angle of a triangle and its interior angles?

• An exterior angle is equal to the sum of all three interior angles.

• An exterior angle is equal to the sum of the two non-adjacent interior angles.

• An exterior angle is equal to the sum of the two adjacent interior angles.

• An exterior angle is always 90 degrees.