Angles in Triangles

Front

What is the sum of the angle measures in a triangle?

Back

180°

Front

What type of angle is less than 90°?

Back

Acute angle

Front

What type of angle is exactly 90°?

Back

Right angle

Front

What type of angle is greater than 90° but less than 180°?

Back

Obtuse angle

Front

What type of triangle has all angles less than 90°?

Back

Acute triangle

Front

What type of triangle has one angle that is exactly 90°?

Back

Right triangle

Front

What type of triangle has one angle that is greater than 90°?

Back

Obtuse triangle

Front

Can a triangle have two obtuse angles?

Back

No, a triangle cannot have two obtuse angles.

Front

What is the relationship between the angles in a triangle?

Back

The sum of the angles in a triangle is always 180°.

Front

If one angle in a triangle is 90°, what type of triangle is it?

Back

It is a right triangle.