Circle Geometry Flashcards

1
Q

What is the circumference?

A

The perimeter

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2
Q

What is the diameter?

A

A line going through the centre of the circle

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3
Q

What is the radius?

A

Half the diameter

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4
Q

What is a chord?

A

A line which both ends connect to the circumference

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5
Q

What is a tangent?

A

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

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6
Q

What is a sector?

A
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7
Q

What is an arc?

A
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8
Q

What are segments?

A

Areas split by a chord

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9
Q

Which rule is this?

A

The angle in a semi circle is a right angle.

two radii form a triangle

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10
Q

Which rule is this?

A

A tangent meets a radius at 90

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11
Q

Which rule is this?

A

A triangle formed by two radii are isosceles.

All radii are the same length.

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12
Q

What rule is this?

A

A diameter bisects a chord at a right angle.

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13
Q

Which rule is this?

A

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

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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

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15
Q

Which rule is this?

A

Opposite angles in a cyclic quadrilateral = 180o

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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.