Classifying Triangles/Triangle Sum theorem

Front

What is the Triangle Sum Theorem?

Back

The Triangle Sum Theorem states that the sum of the interior angles of a triangle is always 180 degrees.

Front

What are the three types of triangles based on angles?

Back

1. Acute Triangle: All angles are less than 90 degrees. 2. Right Triangle: One angle is exactly 90 degrees. 3. Obtuse Triangle: One angle is greater than 90 degrees.

Front

What are the three types of triangles based on sides?

Back

1. Equilateral Triangle: All sides are equal. 2. Isosceles Triangle: Two sides are equal. 3. Scalene Triangle: All sides are different.

Front

If one angle of a triangle is 90 degrees and another is 50 degrees, what is the measure of the third angle?

Back

The third angle is 40 degrees (180 - 90 - 50 = 40).

Front

What type of triangle has only one obtuse angle and two congruent sides?

Back

Obtuse Isosceles Triangle.

Front

How do you find the measure of a missing angle in a triangle?

Back

Subtract the sum of the known angles from 180 degrees.

Front

What is an Isosceles Triangle?

Back

An Isosceles Triangle is a triangle that has at least two sides that are equal in length.

Front

What is a Scalene Triangle?

Back

A Scalene Triangle is a triangle in which all sides and angles are different.

Front

What is an Acute Triangle?

Back

An Acute Triangle is a triangle where all three angles are less than 90 degrees.

Front

What is a Right Triangle?

Back

A Right Triangle is a triangle that has one angle measuring exactly 90 degrees.