Triangle Classification and Properties

The video tutorial covers the classification of triangles based on their sides and angles. It begins with an introduction to the topic, followed by a detailed explanation of equilateral, isosceles, and scalene triangles, which are classified by the lengths of their sides. The tutorial then discusses right, acute, and obtuse triangles, classified by their angles. The instructor shares a story about a student attempting to draw a triangle with multiple obtuse angles, illustrating the impossibility of such a task. The video concludes with a practice exercise for drawing triangles with different properties, preparing students for the next lesson.

What are the two main criteria for classifying triangles?

• Side lengths and angle measures

• Color and size

• Perimeter and area

• Height and base

What is a key characteristic of an equilateral triangle?

• It has a right angle

• All sides are equal

• Two sides are equal

• All sides are different lengths

What is the measure of each angle in an equilateral triangle?

• 45 degrees

• 60 degrees

• 120 degrees

• 90 degrees

How many sides of an isosceles triangle are of equal length?

• One

• Three

• None

• Two

Which of the following is true about scalene triangles?

• No sides are equal

• All sides are equal

• Two sides are equal

• It has a right angle

What type of triangle has one right angle?

• Equilateral

• Isosceles

• Scalene

• Right triangle

How many acute angles does an acute triangle have?

• None

• Two

• One

• Three

What is true about an obtuse triangle?

• All angles are acute

• It has one obtuse angle

• It has three obtuse angles

• It has two obtuse angles

Which triangle has all angles measuring less than 90 degrees?

• Right triangle

• Obtuse triangle

• Acute triangle

• Scalene triangle

What is the sum of all angles in any triangle?

• 360 degrees

• 270 degrees

• 180 degrees

• 90 degrees