Classify triangles

Front

What is a triangle?

Back

A triangle is a three-sided polygon.

Tags

CCSS.2.G.A.1

Front

How can triangles be classified based on their sides?

Back

Triangles can be classified as Equilateral (all sides equal), Isosceles (two sides equal), or Scalene (no sides equal).

Tags

CCSS.4.G.A.2

Front

How can triangles be classified based on their angles?

Back

Triangles can be classified as Acute (all angles less than 90°), Right (one angle equal to 90°), or Obtuse (one angle greater than 90°).

Tags

CCSS.4.G.A.2

Front

What is an Equilateral triangle?

Back

An Equilateral triangle has all three sides of equal length and all angles measuring 60°.

Tags

CCSS.4.G.A.2

Front

What is an Isosceles triangle?

Back

An Isosceles triangle has at least two sides of equal length and the angles opposite those sides are equal.

Tags

CCSS.4.G.A.2

Front

What is a Scalene triangle?

Back

A Scalene triangle has all sides of different lengths and all angles of different measures.

Tags

CCSS.4.G.A.2

Front

What is a Right triangle?

Back

A Right triangle has one angle that measures exactly 90°.

Tags

CCSS.4.G.A.2

Front

What is an Acute angle?

Back

An Acute angle is an angle that measures less than 90°.

Tags

CCSS.4.G.A.1

Front

What is an Obtuse angle?

Back

An Obtuse angle is an angle that measures more than 90° but less than 180°.

Tags

CCSS.4.G.A.1

Front

What is a straight angle?

Back

A straight angle is an angle that measures exactly 180°.

Tags

CCSS.4.G.A.1