Triangles by angles

What are the three types of angles that we use to identify types triangles.

• acute, obtuse, right angles

• obtuse, scalene,

  and right angles

• isosceles, scalene, and equilateral

Tags

CCSS.4.G.A.2

What is an acute angle?

• An angle that measures 90°

• An angle that measures more than 90° and less than 180°

• An angle that measures between 0 and 90°

  Always less than 90°

• An angle that measures more than 180°

Tags

CCSS.4.G.A.1

What is a right angle?

• A right angle measures exactly 180°

• A right angle measures exactly 90°

• A right angle is always less than 90°

Tags

CCSS.4.G.A.1

What is an obtuse angle?

• An angle that measures less than 90°

• An angle that measures exactly 90°

• An angle that measures more than 90° and less than 180°

Tags

CCSS.4.G.A.1

Classify the triangle by its angles.

• Acute Triangle
• Right Triangle
• Obtuse Triangle

Tags

CCSS.4.G.A.2

True or False
An obtuse triangle has 1 obtuse angle.

• True
• False

Tags

CCSS.4.G.A.2

Classify this triangle by its angles

• Acute

• Obtuse

• Equilangular

• Right

Tags

CCSS.4.G.A.2

• acute

• obtuse

• right

Tags

CCSS.4.G.A.2

Classify this triangle by its angles

• Acute

• Right

• Obtuse

Tags

CCSS.4.G.A.2

Classify this triangle by its angles

• Acute

• Right

• Obtuse

Tags

CCSS.4.G.A.2