The video tutorial explains how to classify triangles based on their angles. It covers the types of triangles: acute, obtuse, right, and equiangular. The tutorial demonstrates how to identify an obtuse triangle by checking if it contains at least one obtuse angle, using an example where the angle is 102 degrees.

Which of the following is NOT a type of triangle based on angles?

• Acute

• Right

• Obtuse

• Scalene

What is a defining characteristic of an acute triangle?

• It has one 90-degree angle.

• All angles are less than 90 degrees.

• It has one angle greater than 90 degrees.

• All angles are equal.

Which type of triangle must have a 90-degree angle?

• Acute

• Obtuse

• Right

• Equiangular

What is true about the angles in an equiangular triangle?

• All angles are equal and acute.

• It has one 90-degree angle.

• It has one angle greater than 90 degrees.

• All angles are different.

Which type of triangle has at least one angle greater than 90 degrees?

• Acute

• Obtuse

• Right

• Equiangular