Classifying Triangles

Front

What is a triangle?

Back

A polygon with three edges and three vertices.

Front

What are the three types of triangles based on side lengths?

Back

Equilateral, Isosceles, and Scalene.

Front

What are the three types of triangles based on angles?

Back

Acute, Right, and Obtuse.

Front

Define an acute triangle.

Back

A triangle where all three angles are less than 90 degrees.

Front

Define a right triangle.

Back

A triangle that has one angle equal to 90 degrees.

Front

Define an obtuse triangle.

Back

A triangle that has one angle greater than 90 degrees.

Front

What is the sum of the interior angles of a triangle?

Back

180 degrees.

Front

What is a complementary angle?

Back

Two angles that add up to 90 degrees.

Front

Provide an example of complementary angles.

Back

81° and 9°.

Front

What is the relationship between the angles in a right triangle?

Back

One angle is 90 degrees, and the sum of the other two angles is 90 degrees.