Classifying Triangles

Front

What is a triangle?

Back

A triangle is a polygon with three edges and three vertices.

Front

What are the three 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 is an equilateral triangle?

Back

An equilateral triangle is a triangle that has three equal sides and three equal angles, each measuring 60°.

Front

What is an isosceles triangle?

Back

An isosceles triangle is a triangle that has at least two equal sides and the angles opposite those sides are equal.

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°.

Front

What is a right triangle?

Back

A right triangle is a triangle that has one angle measuring exactly 90°.

Front

What is an obtuse triangle?

Back

An obtuse triangle is a triangle that has one angle measuring more than 90°.

Front

How do you classify triangles based on angles?

Back

1. Acute Triangle: All angles < 90°. 2. Right Triangle: One angle = 90°. 3. Obtuse Triangle: One angle > 90°.

Front

What is the sum of the angles in a triangle?

Back

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