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Physicss Physics A Level Physics Home Revision hut Click here for Parts of circle
Angles in circles
All angles in a semi circle are 90
o
The angle subtended at the centre is twice
the angle at the circumference
A A tangent is a line which touches the circle and makes an angle Of 900 with the radius of the circle The angle between the tangent and a chord is equal to the angle subtended in the opposite segment
Centre of circle
radius
Chord
Segment
Diameter (twice the radius)
Sector
Parts of a circle
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Circumference Circumference of a circle = 2 x 𝜋 X r Or 𝜋 �� X D Area of a circle = 𝜋 X r2