Classifying Triangles by Angle Properties

This video tutorial explains how to classify triangles based on their angle properties. It covers the three types of angles: right, obtuse, and acute, and demonstrates how to identify and classify triangles as right, obtuse, or acute based on these angles. The tutorial includes examples of each type of triangle and concludes with a summary of the classification process.

What is the term for a closed two-dimensional shape made up of line segments?

• Ellipse

• Circle

• Polygon

• Cylinder

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CCSS.1.G.A.1

CCSS.2.G.A.1

What defines a polygon?

• A shape with curved lines

• A closed two-dimensional shape made up of line segments

• A three-dimensional object

• A shape with at least five sides

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CCSS.1.G.A.1

CCSS.2.G.A.1

How many sides does a triangle have?

• Six

• Four

• Three

• Two

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CCSS.2.G.A.1

What type of angle is larger than a right angle?

• Straight

• Acute

• Obtuse

• Reflex

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CCSS.4.G.A.1

What is a triangle with a right angle called?

• Right triangle

• Equilateral triangle

• Acute triangle

• Obtuse triangle

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CCSS.4.G.A.2

Which triangle has one angle larger than 90 degrees?

• Scalene triangle

• Acute triangle

• Right triangle

• Obtuse triangle

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CCSS.4.G.A.2

Which triangle has all angles smaller than a right angle?

• Acute triangle

• Obtuse triangle

• Isosceles triangle

• Right triangle

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CCSS.4.G.A.2

Which of the following is not a type of triangle based on angle properties?

• Right triangle

• Obtuse triangle

• Acute triangle

• Circular triangle

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CCSS.4.G.A.2

What type of triangle has angles all smaller than 90 degrees?

• Equilateral

• Right

• Acute

• Obtuse

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CCSS.4.G.A.2

How can we verify a right angle in a triangle?

• Using a right angle model

• Comparing it to an acute angle

• Measuring the side lengths

• Using a protractor

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CCSS.4.G.A.1