Classifying Triangles by Angles

An acute triangle has __________ angles that each measure less than 90°.

• one

• two

• three

• four

Tags

CCSS.4.G.A.1

CCSS.4.G.A.2

Classify this triangle

• right

• obtuse

• acute

Tags

CCSS.4.G.A.1

CCSS.4.G.A.2

Classify this triangle.

• right

• acute

• obtuse

Tags

CCSS.4.G.A.1

CCSS.4.G.A.2

Classify this triangle.

• obtuse

• right

• acute

Classify this triangle.

• right

• acute

• obtuse

Tags

CCSS.4.G.A.1

CCSS.4.G.A.2

Classify this triangle.

• acute

• right

• obtuse

Tags

CCSS.4.G.A.1

CCSS.4.G.A.2

Classify this triangle.

• Right

• Acute

• Obtuse

When classified by its angles this is a/an _____ triangle.

• right

• obtuse

• acute

When classified by its angles this is an acute triangle because _____.

• it has one acute angle

• it has two acute angles

• all three angles are acute

When classified by its angles this is an obtuse triangle because _____.

• it has one angle less than 90°

• it has one angle equal to 90°

• it has one angle more than 90°