Classifying Triangles by Sides and Angles

The video tutorial covers the classification of triangles based on their sides and angles. It introduces key vocabulary and concepts such as equilateral, isosceles, and scalene triangles, as well as acute, right, and obtuse angles. The tutorial also explains how to organize triangles into a hierarchy and use Venn diagrams for classification. The video aims to help students understand and apply these concepts in geometry.

What does 'classifying' mean in the context of geometry?

• Measuring the sides of shapes

• Calculating the area of shapes

• Grouping shapes into categories

• Drawing shapes accurately

What does 'congruent' mean?

• Having the same color

• Having a different size

• Being in the same position

• Having the same size and shape

What is an equilateral triangle?

• A triangle with two equal sides

• A triangle with no equal sides

• A triangle with all sides equal

• A triangle with one right angle

What does a triangle with two congruent sides and one different side represent?

• Equilateral triangle

• Scalene triangle

• Isosceles triangle

• Acute triangle

What is an isosceles triangle?

• A triangle with all sides of different lengths

• A triangle with all sides equal

• A triangle with one obtuse angle

• A triangle with two equal sides

Which triangle has sides of different lengths?

• Acute

• Scalene

• Isosceles

• Equilateral

What type of angle is less than 90 degrees?

• Acute

• Straight

• Right

• Obtuse

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

• Acute triangle

• Obtuse triangle

• Right triangle

• Isosceles triangle

What type of triangle has one right angle?

• Equilateral triangle

• Scalene triangle

• Right triangle

• Acute triangle

In a Venn diagram, where do isosceles triangles belong?

• In the smaller circle only

• Outside both circles

• In the larger circle only

• In both circles