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Slide 2

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Sector of a circle
A SECTOR is a slice
17cm
of the circle
51°
O
This sector is 51 of the circle
360
Area of sector = 51 ÷ 360 × × 17…read more

Slide 3

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Circle graphs ­ draw with compass
5
x² + y² = 25
-5 5
Centre origin, radius = 5
-5
x² + y² = 49
Centre origin, radius = 7…read more

Slide 4

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ANGLES ON Angle at centre
CIRCUMFERENCE
A
A
O
A
2A
A
Centre = 2 × Circumference
90°
O
CHORD ­ The angles
produced by this chord at the
circumference are all equal
Diameter gives right angle…read more

Slide 5

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Cyclic Quadrilateral Radius & Tangent
CYCLIC ­ All 4 corners of
the quadrilateral are on
circumference
A
90°
A + B = 180°
B
Radius meets tangent at 90°
The opposite angles add to
180…read more

Slide 6

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Alternate segment 2 Tangents from 1
theorem point
A
90°
A
A
90°
A
Note the equal angles (A and
90°)
Note the equal sides (shown by
single and double dash marks)…read more

Comments

daviesg

A mixed sorce of circle facts.  Some circle theorems (all well presented) and fractions of a circle (sectors and arcs).

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