Classifying Triangles by Angles

The video tutorial explains how to classify triangles based on their angles. It covers right triangles, acute triangles, and obtuse triangles, using the concept of degrees and circle analogy to explain angle measurements. The largest angle in a triangle determines its classification: right triangles have a 90-degree angle, acute triangles have angles less than 90 degrees, and obtuse triangles have angles greater than 90 degrees.

What type of triangle has one angle exactly 90 degrees?

• Equilateral triangle

• Acute triangle

• Right triangle

• Obtuse triangle

Tags

CCSS.4.G.A.2

What does perpendicular mean in the context of angles?

• Angles less than 90 degrees

• Angles exactly 90 degrees

• Angles more than 90 degrees

• Angles that are equal

Tags

CCSS.4.G.A.1

How many degrees are there in a full circle?

• 180 degrees

• 270 degrees

• 360 degrees

• 90 degrees

Tags

CCSS.4.MD.C.5B

CCSS.HSG.CO.A.1

What angle do your floor and walls typically meet at?

• Right angle

• Obtuse angle

• Straight angle

• Acute angle

Tags

CCSS.4.G.A.1

What is the degree measure of a right angle?

• 360 degrees

• 180 degrees

• 90 degrees

• 45 degrees

Tags

CCSS.4.G.A.1

What is the term for an angle smaller than 90 degrees?

• Acute angle

• Obtuse angle

• Straight angle

• Right angle

Tags

CCSS.4.G.A.1

Which triangle is characterized by all angles being less than 90 degrees?

• Acute triangle

• Isosceles triangle

• Obtuse triangle

• Right triangle

Tags

CCSS.4.G.A.2

What is an obtuse angle?

• An angle more than 90 degrees

• An angle less than 180 degrees

• An angle less than 90 degrees

• An angle exactly 90 degrees

Tags

CCSS.4.G.A.1

Which triangle has the largest angle greater than 90 degrees?

• Acute triangle

• Right triangle

• Obtuse triangle

• Scalene triangle

Tags

CCSS.4.G.A.2

What is the significance of the largest angle in naming triangles?

• It has no significance

• It determines the symmetry of the triangle

• It determines the size of the triangle

• It determines the type of triangle