Understanding Circles and Circumference

What is the definition of a circle?

• A set of points equidistant from a center point

• A line segment with two endpoints

• A shape with four equal sides

• A polygon with three sides

Which of the following is a chord?

• A segment from the center to a point on the circle

• A line that touches the circle at one point

• A segment with endpoints on the circle

• A line passing through the center

What makes two circles congruent?

• Being in the same plane

• Having congruent radii

• Being the same color

• Having the same diameter

What is a concentric circle?

• Circles with different centers

• Circles with the same center

• Circles with the same radius

• Circles with the same diameter

If the diameter of a circle is 22 units, what is the radius?

• 22 units

• 11 units

• 44 units

• 5 units

How do you calculate the circumference of a circle?

• Diameter times pi

• Radius plus pi

• Radius times pi

• Diameter plus pi

What is the circumference of a circle with a radius of 30 feet?

• 60 pi feet

• 90 pi feet

• 30 pi feet

• 120 pi feet

If a circle's circumference is 65.4 feet, what is its diameter to the nearest hundredth?

• 20.8 feet

• 21.8 feet

• 22.8 feet

• 23.8 feet

What does it mean for a polygon to be inscribed in a circle?

• All vertices lie inside the circle

• All vertices lie on the circle

• The circle is outside the polygon

• The circle is inside the polygon

In a 45-45-90 triangle, if one leg is 1, what is the hypotenuse?

• 3

• Root 2

• 2

• 1