Exploring Circles, Arcs, and Central Angles

What is the line called that goes from one side of the circle to the other, passing through the center?

• Secant

• Chord

• Diameter

• Radius

Which term describes a line that touches the circle at exactly one point?

• Tangent

• Secant

• Chord

• Radius

What is the degree measure of a semicircle?

• 270 degrees

• 90 degrees

• 180 degrees

• 360 degrees

If an arc is less than a semicircle, what is it called?

• Major arc

• Full arc

• Minor arc

• Central arc

What is the relationship between a central angle and its corresponding arc?

• There is no relationship

• The central angle is half the arc

• The central angle is twice the arc

• The central angle is equal to the arc

How do you name a major arc?

• Using two letters

• Using three letters

• Using four letters

• Using one letter

What is the measure of an arc if its central angle is 35 degrees?

• 25 degrees

• 17.5 degrees

• 35 degrees

• 70 degrees

If an arc named UW is less than a semicircle, what type of arc is it?

• Major arc

• Minor arc

• Central arc

• Full arc

What is the measure of a central angle if the connected arc is 50 degrees?

• 50 degrees

• 100 degrees

• 25 degrees

• 75 degrees

Why is it important to draw triangles when studying arcs and angles?

• To measure the radius

• To understand the relationships

• To calculate the diameter

• To find the circumference