Angle Addition Postulate

Front

What is the Angle Addition Postulate?

Back

The Angle Addition Postulate states that if point B is in the interior of angle AOC, then m∠AOB + m∠BOC = m∠AOC.

Front

What is a vertex in geometry?

Back

A vertex is a point where two or more lines or edges meet. In the context of angles, it is the point where the two rays of the angle meet.

Front

How do you name an angle using its vertex?

Back

An angle can be named using its vertex and any two points on the rays. For example, angle AOB can be named as ∠AOB or ∠BOA.

Front

What is an acute angle?

Back

An acute angle is an angle that measures less than 90 degrees.

Front

What is a right angle?

Back

A right angle is an angle that measures exactly 90 degrees.

Front

What is an obtuse angle?

Back

An obtuse angle is an angle that measures more than 90 degrees but less than 180 degrees.

Front

What is a straight angle?

Back

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

Front

If m∠AOB = 30° and m∠BOC = 50°, what is m∠AOC?

Back

m∠AOC = m∠AOB + m∠BOC = 30° + 50° = 80°.

Front

If m∠DEF = 180°, what type of angle is it?

Back

It is a straight angle.

Front

What is the sum of the angles in a triangle?

Back

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