Types of Triangles and Their Properties

This video tutorial explores the four types of triangles: equilateral, isosceles, right-angled, and scalene. It explains the unique properties of each type, such as side lengths, angle measures, lines of symmetry, and rotational symmetry. The video also highlights how to identify each triangle type based on these characteristics.

What is a common feature of all triangles?

• They have three straight sides.

• They have four sides.

• They have two equal angles.

• They have one right angle.

Which of the following is true about equilateral triangles?

• They have no rotational symmetry.

• All angles are 60 degrees.

• They have one line of symmetry.

• They have two equal sides.

How many lines of symmetry does an equilateral triangle have?

• One

• None

• Two

• Three

What is a key characteristic of isosceles triangles?

• Two sides are the same length.

• They have three lines of symmetry.

• They have a right angle.

• All sides are different lengths.

How many angles are equal in an isosceles triangle?

• Two

• None

• Three

• One

What is unique about right-angled triangles?

• They have three equal sides.

• They have a right angle.

• They have two lines of symmetry.

• All angles are equal.

In which case does a right-angled triangle have a line of symmetry?

• When it is scalene.

• When it is equilateral.

• When it is isosceles.

• When it is obtuse.

What distinguishes scalene triangles from other types?

• All sides are equal.

• Two sides are equal.

• All sides are different lengths.

• They have a right angle.

How many lines of symmetry does a scalene triangle have?

• Two

• None

• One

• Three

Which type of triangle has no rotational symmetry?

• Equilateral

• Scalene

• Isosceles

• Right-angled