Classifying Triangles & Finding missing angles

Front

What is a triangle?

Back

A triangle is a polygon with three edges and three vertices. It is one of the basic shapes in geometry.

Front

What are the types of triangles based on side lengths?

Back

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

Front

What are the 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

How do you classify a triangle with one angle greater than 90 degrees?

Back

It is classified as an Obtuse Triangle.

Front

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

Back

The sum of the interior angles of a triangle is always 180 degrees.

Front

If two angles of a triangle are 50 degrees and 60 degrees, what is the measure of the third angle?

Back

The third angle is 70 degrees (180 - 50 - 60 = 70).

Front

What type of triangle has three equal angles?

Back

An Equilateral Triangle, where each angle measures 60 degrees.

Front

What is an Isosceles Triangle?

Back

An Isosceles Triangle has at least two sides that are equal in length and the angles opposite those sides are equal.

Front

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

Back

Subtract the sum of the known angles from 180 degrees.

Front

What is a Right Isosceles Triangle?

Back

A Right Isosceles Triangle has one 90-degree angle and two equal sides.