Parts of a Circle

Front

What is the name of the irrational number used when doing calculations for circles?

Back

pi

Front

What is the length around a circle called?

Back

circumference

Front

What is the distance from the center of a circle to any point on its edge called?

Back

radius

Front

What is the distance across a circle through its center called?

Back

diameter

Front

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

Back

10 cm

Front

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

Back

C = 2πr or C = πd

Front

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

Back

28.27 cm² (using A = πr²)

Front

What part of the circle is represented by the line segment that connects two points on the circle?

Back

chord

Front

What is the term for a line that touches a circle at exactly one point?

Back

tangent

Front

What is the center of a circle?

Back

The point that is equidistant from all points on the circle.