Circle Theorems

Circle theorers

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  • Created by: tash
  • Created on: 11-02-10 18:05

Angles on the same arc

Angles subtended on the same arc (http://www.mathsrevision.net/gcse/Circle1.gif)

Angles formed from two points on the circumference are equal to other angles, in the same arc, formed from those two points.

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Tangent

angle with a tangent (http://www.mathsrevision.net/gcse/Circle3.gif)

Angle on a Tangent is 90'

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Angles in a semi circle

angle in a semi-circle (http://www.mathsrevision.net/gcse/Circle9.gif)

Angles formed by drawing lines from the ends of the diameter of a circle to its circumference form a right angle. So c is a right angle.

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Angle at centre is double angle at Circumference

Angle at the centre (http://www.mathsrevision.net/gcse/Circle4.gif)

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Comments

Aravind

Thats pretty good, but you are missing some other key points, like opposite angles of a square in a circle adds up to 180 degrees. But still, not bad.

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