Lines and Angles and Circles

135° 145° 35° 45°

• 135°

• 145°

• 35°

• 45°

Which of the following names a radius?

• segment AC

• segment DB

• segment AB

• segement BC

What is the part of the circle highlighted in red called?

• semi-circle arc

• major arc

• minor arc

• sector

What is the part of the circle highlighted in red called?

• semi-circle arc

• major arc

• minor arc

• sector

Mathematical Equivalence

ON

The image shows a circle centered at point O. Angle AOB measures 50 degrees. What is the measure of angle ACB? (a)  

• 25 degrees

• 40 degrees

• 50 degrees

• 100 degrees

Find the value of x.

Mathematical Equivalence

ON

Think about if the angles are equal or if they add up to 180. Solve for x. Plug it in.

Mathematical Equivalence

ON

Solve for x:

Mathematical Equivalence

ON

A chord is a segment that connects ___________

• the center to the endpoint

• to one point outside the circle

• a central angle

• 2 endpoints of a circle