# Circle Geometry Flashcards Preview

## IGCSE Edexcel Maths > Circle Geometry > Flashcards

Flashcards in Circle Geometry Deck (19)
1
Q

What is the circumference?

A

The perimeter

2
Q

What is the diameter?

A

A line going through the centre of the circle

3
Q

A

Half the diameter

4
Q

What is a chord?

A

A line which both ends connect to the circumference

5
Q

What is a tangent?

A

A line that touches the circle at one point from the outside

6
Q

What is a sector?

A
7
Q

What is an arc?

A
8
Q

What are segments?

A

Areas split by a chord

9
Q

Which rule is this?

A

The angle in a semi circle is a right angle.

10
Q

Which rule is this?

A

A tangent meets a radius at 90

11
Q

Which rule is this?

A

A triangle formed by two radii are isosceles.

All radii are the same length.

12
Q

What rule is this?

A

A diameter bisects a chord at a right angle.

13
Q

Which rule is this?

A

The angle at the centre is twice the angle at the circumference.

14
Q

What rule is this?

A

Angles in the same segment are equal

All triangles drawn from a chord will have the same angle where they touch the circumference

15
Q

Which rule is this?

A

Opposite angles in a cyclic quadrilateral = 180o

16
Q

Which rule is this?

A

Tangents from the same point are the same length.

also form 2 congruent right angle triangles

17
Q

Which rule is this?

A

Alternate segment theorem

angle in the alternate segment are equal

18
Q

Which rule is this?

A

Internal intersection

AE x CE = DE x BE

measured from intersection

19
Q

Which rule is this?

A

External intersection

MP x MQ = MN x MO

Measured from intersection.