Radius, Diameters, Circumference, Area of Circles

Estimate the circumference of the circle. Select all that apply.

The radius is 5 feet long.

• about 10 + 3 feet

• about 10 x 3 feet

• about 15 feet

• about 5 x 3 feet

• about 30 feet

Estimate the circumference of the circle.

Select all that apply.

• About 12 mm x 3

• About 36 mm

• About 12 mm + 3

• About 12 mm ÷ 3

Which statement is true about the circle?

• DB is the diameter of this circle.

• EA is the only radius in this circle.

• DB is the only chord in this circle.

• AE , AF , and AC are all radii in this circle.

Which statement would describe a chord?

• A chord is a line segment connecting any two points on a circle.

• A chord is a line segment joining the center of a circle to any point on a the circle.

• A chord is the distance around a circle.
  

• A chord is always the longest segment of a circle.

Read each statement below about circles. Click on all true statements.

• The diameter of a circle is a line segment that touches two points on the circle and must go through the center.

• The diameter of a circle can also be called a chord because it touches two points on the circle.

• All chords are also considered diameters of a circle.

• A chord is a line segment that must touch two points on the circle.

• The distance around a circle is known as the circumference.

In the figure above, point C is the center of the circle. Which two points can be connected to form a diameter?

• Points R and T

• Points R and S

• Points Q and C

• Points R and C

Which describes the radius of the trampoline?

• The size of the tarp used to cover the trampoline.

• The distance around the edge of the trampoline.

• The distance from one edge of the trampoline through the center to another edge of the trampoline.

• The distance from the center of the trampoline to the edge of the trampoline.

Which terms describe the line segment in the circle?

• Center point

• Radius

• Circumference

• Chord

• Diameter

Which of the following circles has a diameter of 25 ft.?

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• 
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Using the circle above, which two points cannot be connected to form a radius?

• Points S and R

• Points Q and C

• Points C and T

• Points S and C