In the diagram , X ,Y and Z are the points of contact of tangents BC , CA and AB respectively to a circle with centre O . If angle ACB is a right angle , prove that angle AOB =135 degree .

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- Nov 7th 2009, 07:33 AMthereddevilsGeometry (1)
In the diagram , X ,Y and Z are the points of contact of tangents BC , CA and AB respectively to a circle with centre O . If angle ACB is a right angle , prove that angle AOB =135 degree .

- Nov 7th 2009, 07:58 AMGrandad
- Nov 7th 2009, 07:44 PMthereddevils