Triangle Properties and Classifications

The video tutorial covers the classification of triangles based on their angles and sides. It explains the different types of triangles, such as right, obtuse, and acute triangles, as well as isosceles, scalene, and equilateral triangles. The tutorial also includes practical problem-solving exercises, demonstrating how to apply these classifications to solve algebraic problems involving triangles.

What are the two main criteria for classifying triangles?

• Angles and sides

• Color and size

• Height and base

• Perimeter and area

Which of the following is not a classification based on angles?

• Equilateral

• Acute

• Right

• Obtuse

How many 90° angles does a right triangle have?

• Three

• Two

• One

• None

Can a triangle have two 90° angles?

• Depends on the triangle

• Only in special cases

• No

• Yes

What is the range of an obtuse angle in a triangle?

• Greater than 180°

• Greater than 90° but less than 180°

• Exactly 90°

• Less than 90°

Which angle is less than 90°?

• Straight

• Obtuse

• Right

• Acute

What is a key characteristic of an isosceles triangle?

• It has a right angle

• All angles are different

• At least two sides are equal

• All sides are different

In a scalene triangle, how many sides are equal?

• None

• One

• Two

• Three

What is true about the sides of an equilateral triangle?

• Two sides are equal

• All sides are equal

• It has a right angle

• All sides are different

What is also true about the angles in an equilateral triangle?

• All angles are different

• Two angles are equal

• It has a right angle

• All angles are equal