Understanding Triangles

What are the two main categories used to classify triangles?

• By angles and side lengths

• By color and size

• By perimeter and area

• By height and base

Which of the following is a characteristic of a right triangle?

• One angle is exactly 90°

• All angles are less than 90°

• One angle is more than 90°

• All sides are of different lengths

How can you identify a right angle in a triangle?

• By a star symbol

• By a square symbol

• By a triangle symbol

• By a circle symbol

What is the sum of angles in an acute triangle?

• 180°

• 270°

• 90°

• 360°

Which of the following is true about an acute triangle?

• It has two angles greater than 90°

• All angles are less than 90°

• All angles are exactly 90°

• It has one angle greater than 90°

What is a key characteristic of an obtuse triangle?

• All angles are right angles

• All angles are acute

• It has one obtuse angle

• It has two obtuse angles

Why can an obtuse triangle have only one obtuse angle?

• Because it would become an acute triangle

• Because it would become a right triangle

• Because it would have no angles left

• Because two obtuse angles would exceed 180°

What is the sum of angles in any triangle?

• 90°

• 180°

• 360°

• 270°

Which triangle has all sides of different lengths?

• Scalene triangle

• Isosceles triangle

• Equilateral triangle

• Right triangle

What is true about the angles in an equilateral triangle?

• All angles are 90°

• All angles are obtuse

• All angles are different

• All angles are 60°