Classifying Triangles by Angles

This lesson covers classifying triangles by their angles, including right, obtuse, and acute triangles. It explains how to use Venn diagrams for classification and employs higher order thinking to identify triangles. The lesson also demonstrates creating triangles from rectangles and squares, and concludes with a preview of the next lesson on lines.

What type of angle does a right triangle always include?

• Obtuse angle

• Acute angle

• Straight angle

• Right angle

How many acute angles are there in an acute triangle?

• Three

• Two

• None

• One

What is the term used for a point where two line segments meet?

• Edge

• Vertex

• Intersection

• Axis

Which triangle cannot have more than one obtuse angle?

• Obtuse triangle

• Right triangle

• All triangles

• Acute triangle

If a triangle has one right angle and two acute angles, what type of triangle is it?

• Obtuse triangle

• Right triangle

• Equilateral triangle

• Acute triangle

What is the maximum number of right angles a triangle can have?

• Two

• One

• Three

• None

In a Venn diagram for triangle classification by angles, why do the circles not overlap?

• All triangles have only acute angles

• Each triangle type is mutually exclusive

• Venn diagrams are not suitable for triangles

• Triangles can have mixed angle types

What type of triangles are formed when a diagonal line is drawn from one vertex to the opposite in a square?

• Acute triangles

• Obtuse triangles

• Isosceles triangles

• Right triangles

Which statement is true about the sides of a square when diagonals are drawn?

• Creates two obtuse triangles

• Creates one right triangle

• Creates four right triangles

• Creates two acute triangles

What happens when a line segment is drawn from one vertex to the opposite in a rectangle?

• Forms two obtuse triangles

• Forms two right triangles

• Forms two acute triangles

• Forms four right triangles