Geometry of the Circle

Question 1

Circumference

Answer 1

The perimeter of a circle. The boundary line of a circle.

Question 2

Centre

Answer 2

The central point inside the circle which has the same distance from all points on the circumference of the
circle.

Question 3

Radius

Answer 3

The distance from the centre to the circumference of a circle. The plural of radius is radii.

Question 4

Diameter

Answer 4

The distance across a circle and through the centre. The diameter has a measure of twice the radius of the circle.

Question 5

Chord

Answer 5

A line segment that joins two points on the circumference, but not passing through the centre.

Question 6

Segment

Answer 6

The part of a circle that is between a chord and the circumference. It can be either a minor or a major segment.

Question 7

Arc

Answer 7

The part of the circumference between 2 radii. It can be either a minor or a major arc.

Question 8

Quadrant

Answer 8

A quarter of a circle.

Question 9

Sector

Answer 9

The part of a circle between 2 radii. It can be either a minor or a major sector.

Question 10

Semi-circle

Answer 10

Half of a full circle