7.9B Circles (radius, diameter, circumference)

Front

To find the circumference of a circle, you must multiply the ________________ by 3.14.

Back

diameter

Front

The distance from the center of the circle to any point on the circle is called the...

Back

radius

Front

To go from radius to diameter I need to do what?

Back

multiply by 2

Front

Determine the radius of the penny.

Back

9.5 mm

Front

A circle has a diameter of 7.6 feet. Which measurement is closest to the circumference of the circle in feet?

Back

23.9 ft

Front

What is the formula for the circumference of a circle?

Back

C = πd or C = 2πr

Front

What is the relationship between radius and diameter?

Back

Diameter is twice the radius.

Front

If the radius of a circle is 5 cm, what is the diameter?

Back

10 cm

Front

If the diameter of a circle is 14 inches, what is the radius?

Back

7 inches

Front

What is the circumference of a circle with a radius of 3 cm?

Back

18.84 cm (C = 2πr)