Circle Basic

Front

What is a sector in a circle?

Back

A sector is a smaller piece of the area of a circle, defined by two radii and the arc between them.

Front

What is the formula for the circumference of a circle?

Back

Circumference = πd or Circumference = 2πr, where d is the diameter and r is the radius.

Front

What is the circumference of a circle with a diameter of 10 meters? (Use π = 3.14)

Back

Circumference = πd = 3.14 * 10 = 31.4 meters.

Front

What is the circumference of a circle with a radius of 10 meters? (Use π = 3.14)

Back

Circumference = 2πr = 2 * 3.14 * 10 = 62.8 meters.

Front

What is a major arc?

Back

A major arc is an arc that is larger than a semicircle, covering more than 180 degrees of the circle.

Front

What is a minor arc?

Back

A minor arc is an arc that is smaller than a semicircle, covering less than 180 degrees of the circle.

Front

What is a semicircle?

Back

A semicircle is an arc that represents half of a circle, covering exactly 180 degrees.

Front

What is a central angle?

Back

A central angle is an angle whose vertex is at the center of the circle and whose sides are radii that extend to the circle.

Front

What is the diameter of a circle?

Back

The diameter is a straight line that passes through the center of the circle, connecting two points on the circle's edge.

Front

What is a radius?

Back

A radius is a line segment from the center of the circle to any point on its circumference.