CIRCLE THEOREMS
INSCRIBED ANGLES THEOREM
An inscibed angle a° is half of the central angle 2a°
![](http://www.mathsisfun.com/geometry/images/inscribed-angle-1.gif)
An angle inscribed in a semicircle is always a right angle The inscibed angle 90°
is half of the central angle 180°
![](http://www.bbc.co.uk/schools/gcsebitesize/maths/images/figure_37.gif)
Angle is on the circumference, it is always 90°
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