Obtuse, Right, and Acute Triangles

What kind of triangle is it?

• acute

• right

• obtuse

• 360 degrees

In an ______________ triangle, all three angles are less than 90 degrees.

• acute

• right

• obtuse

• 360 degrees

In a ____________ triangle one angle is exactly 90 degrees.

• acute

• right

• obtuse

• 360 degrees

A triangle has angle measurements of 51°, 39°, and 90°. What kind of triangle is it?

• acute

• right

• obtuse

• 360 degrees

A triangle has angle measurements of 71°, 82°, and 27°. What kind of triangle is it?

• acute

• right

• obtuse

• 360 degrees

A triangle has angle measurements of 32°, 137°, and 11°. What kind of triangle is it?

• acute

• right

• obtuse

• 360 degrees

What kind of triangle is it?

• acute

• right

• obtuse

• 360 degrees

Identify the triangle by its sides and angles

• Right Isosceles

• Right Scalene

• Obtuse Isosceles

• Obtuse Scalene

Which type of angle is pictured?

• Acute

• Right

• Obtuse

• Straight

Use the angles to classify the triangles