GCSE

Question 1

What is Pi to 6 decimal places?

Answer 1

3.141592

Question 2

Chord

Answer 2

A line segment whose endpoints lie on the circle.

Question 3

Circular Sector

Answer 3

A region bounded by two radii and an arc lying between the radii.

Question 4

Circular Segment

Answer 4

A region, not containing the centre, bounded by a chord and an arc lying between the chord’s endpoints.

Question 5

Diameter

Answer 5

a line segment whose endpoints lie on the circle and which passes through the centre; or the length of such a line segment, which is the largest distance between any two points on the circle. It is a special case of a chord, namely the longest chord, and it is twice the radius.

Question 6

Radius

Answer 6

A line segment joining the centre of the circle to any point on the circle itself; or the length of such a segment, which is half a diameter.

Question 7

Secant

Answer 7

An extended chord, a coplanar straight line cutting the circle at two points.

Question 8

Semircircle

Answer 8

A region bounded by a diameter and an arc lying between the diameter’s endpoints. It is a special case of a circular segment, namely the largest one.

Question 9

Tangent

Answer 9

A coplanar straight line that touches the circle at a single point.

Question 10

Circle

Answer 10

Greek ‘kirkos’, itself a metathesis of ‘krikos’ meaning ‘hoop’ or ‘ring’.

Question 11

Circumference

Answer 11

C = 2πr = πd