Classifying Triangles by Sides and Angles

Front

What is a triangle?

Back

A triangle is a three-sided polygon.

Tags

CCSS.2.G.A.1

Front

What are the three types of triangles based on sides?

Back

Equilateral, Isosceles, and Scalene.

Tags

CCSS.4.G.A.2

Front

What is an equilateral triangle?

Back

A triangle with all three sides equal and all angles measuring 60 degrees.

Tags

CCSS.4.G.A.2

Front

What is an isosceles triangle?

Back

A triangle with at least two sides equal and the angles opposite those sides are equal.

Tags

CCSS.4.G.A.2

Front

What is a scalene triangle?

Back

A triangle with all sides of different lengths and all angles of different measures.

Tags

CCSS.4.G.A.2

Front

What are the three types of triangles based on angles?

Back

Acute, Right, and Obtuse.

Tags

CCSS.4.G.A.2

Front

What is an acute triangle?

Back

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

Tags

CCSS.4.G.A.2

Front

What is a right triangle?

Back

A triangle that has one angle measuring exactly 90 degrees.

Tags

CCSS.4.G.A.2

Front

What is an obtuse triangle?

Back

A triangle that has one angle measuring more than 90 degrees.

Tags

CCSS.4.G.A.2

Front

What does it mean if a triangle has a right angle?

Back

It means that one of its angles is exactly 90 degrees.

Tags

CCSS.4.G.A.2