Types and Properties of Triangles

The video tutorial introduces triangles, explaining their basic properties and types. It covers the classification of triangles based on sides (equilateral, isosceles, scalene) and angles (acute, obtuse, right). The tutorial also includes examples to help identify different types of triangles by their sides and angles.

What is a triangle?

• A simple closed figure with three line segments

• A four-sided polygon

• A shape with two sides

• A circle

Which of the following is true for an equilateral triangle?

• All sides are different

• It has a right angle

• Two sides are equal

• All sides are equal

In an isosceles triangle, how many sides are equal?

• No sides

• One side

• At least two sides

• All three sides

What defines a scalene triangle?

• It has a right angle

• All sides are equal

• Two sides are equal

• All sides are different

What is an acute angled triangle?

• A triangle with one angle more than 90 degrees

• A triangle with two equal sides

• A triangle with all angles less than 90 degrees

• A triangle with a right angle

Which triangle has one angle greater than 90 degrees?

• Right angled triangle

• Acute angled triangle

• Equilateral triangle

• Obtuse angled triangle

What is a right angled triangle?

• A triangle with one angle equal to 90 degrees

• A triangle with one angle more than 90 degrees

• A triangle with all angles less than 90 degrees

• A triangle with all sides equal

In triangle MNO, if angle N is obtuse and two sides are equal, what type of triangle is it?

• Scalene triangle

• Obtuse angled isosceles triangle

• Right angled scalene triangle

• Acute angled equilateral triangle

If a triangle has all angles measuring 60 degrees, what type of triangle is it?

• Right angled triangle

• Obtuse angled triangle

• Acute angled equilateral triangle

• Scalene triangle

What should you remember about triangles?

• They are always scalene

• They can be classified by sides and angles

• They have four sides

• They are always right angled