Circles

• Every circle has _________ degrees.

• 360

• A line that passes through the center of a circle and whose endpoints lie on the circle is called the _____________.

• diameter

• A line that is from any outside point on a circle to the center of the circle is called ______________.

• radius

• Distance around the outside of a circle is called ______________.

• circumference

• Formula for circumference is _________.

• C=pi x diameter (or)

• What decimal number stands for ?

• 3.14

• What fraction number stands for ?

• 22/7 (or)

• What is the formula for the area of a circle?

• If the radius is 10, what is the diameter?

• 20

• If diameter is 30 inches, the radius is ____________

• 15 inches

• What is the circumference of a circle with a radius of 5 inches?

• 31.4 inches

• What is the circumference of a circle with a diameter of 3 cm?

• 9.42

• What is the area of a circle with a diameter of 10 inches?

• 78.5 inches2

• What is the area of a circle with a radius of 10 inches?

• 314 inches2

• If the area of a circle is 153.86cm2, then what is the radius of the circle?

• 7 cm