Classifying Triangles by Angles

The video tutorial teaches students how to classify triangles based on their angles. It covers the three types of triangles: right, obtuse, and acute. Each type is explained with its defining angle properties. The tutorial also includes how to name triangles using angle symbols and provides practice exercises to reinforce learning.

What does the prefix 'tri-' signify in the word 'triangle'?

• Three colors

• Three sides

• Three angles

• Three vertices

Tags

CCSS.2.G.A.1

How many right angles can a right triangle have?

• None

• One

• Two

• Three

Tags

CCSS.8.G.A.5

What type of angle is required for a triangle to be classified as a right triangle?

• Right angle

• Straight angle

• Acute angle

• Obtuse angle

Tags

CCSS.4.G.A.2

Which triangle cannot have more than one right angle?

• Equilateral triangle

• Acute triangle

• Obtuse triangle

• Right triangle

Tags

CCSS.4.G.A.2

What type of triangle is formed if it contains one right angle?

• Scalene triangle

• Obtuse triangle

• Right triangle

• Acute triangle

Tags

CCSS.4.G.A.2

What is the maximum number of obtuse angles an obtuse triangle can have?

• One

• Two

• Three

• None

Tags

CCSS.4.G.A.2

If a triangle has one obtuse angle, what are the other two angles classified as?

• Right

• Straight

• Acute

• Obtuse

Tags

CCSS.4.G.A.2

Which type of triangle has all angles less than 90 degrees?

• Equilateral triangle

• Acute triangle

• Obtuse triangle

• Right triangle

Tags

CCSS.4.G.A.2

What is the name of a triangle that has all three angles acute?

• Acute triangle

• Obtuse triangle

• Isosceles triangle

• Right triangle

Tags

CCSS.4.G.A.2

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

• Right triangle

• Obtuse triangle

• Acute triangle

• Closed triangle

Tags

CCSS.4.G.A.2