Classifying Triangles: Types and Properties

The video tutorial explains how to classify triangles in six ways: three based on side lengths (equilateral, isosceles, scalene) and three based on angle measures (right, acute, obtuse). It emphasizes the properties of each type and provides tips for remembering them. The tutorial concludes with a reminder that triangles can be classified using both side and angle criteria.

How many ways can triangles be classified based on their sides?

• Three

• Two

• Six

• Four

What type of triangle has all sides of equal length?

• Acute

• Isosceles

• Scalene

• Equilateral

What prefix helps to remember that an equilateral triangle has equal sides?

• Iso

• Equi

• Scal

• Acu

What total angle measure do the angles of any triangle add up to?

• 180 degrees

• 360 degrees

• 90 degrees

• 270 degrees

How many sides are equal in an isosceles triangle?

• Two

• None

• One

• Three

What type of triangle has no equal sides?

• Right

• Isosceles

• Scalene

• Equilateral

What angle measure makes a triangle a right triangle?

• Less than 90 degrees

• Exactly 90 degrees

• 180 degrees

• More than 90 degrees

Which triangle has all angles less than 90 degrees?

• Equilateral

• Acute

• Right

• Obtuse

What is required for a triangle to be classified as obtuse?

• Three obtuse angles

• At least two obtuse angles

• No right angles

• One obtuse angle

Can a triangle be classified as both scalene and acute?

• Only if it's isosceles

• Yes

• Only if it's equilateral

• No