Parts of a Circle

Front

What is the straight line that goes through the center of a circle from one side to the opposite side?

Back

Diameter

Front

What is the measurement around the outside of a circle called?

Back

Circumference

Front

What is the line that goes from the center of a circle to any point on the circle?

Back

Radius

Front

What do you call a line segment whose endpoints lie on the circle?

Back

Chord

Front

What is the center point of a circle called?

Back

Center

Front

If the diameter of a circle is 10 cm, what is the radius?

Back

5 cm

Front

What is the formula for calculating the circumference of a circle?

Back

C = πd or C = 2πr

Front

What is the relationship between the diameter and radius of a circle?

Back

Diameter is twice the radius (d = 2r).

Front

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

Back

Area = πr² = 28.27 cm² (approximately).

Front

What is a sector of a circle?

Back

A sector is a portion of a circle enclosed by two radii and the arc between them.