Thread: Geometry (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 .

Hello thereddevils

Originally Posted by thereddevils

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 .

Suppose .

Then

(congruent 's )

(congruent 's )

But

(angle sum of )



(angle sum of )

Grandad

Originally Posted by Grandad

Hello thereddevilsSuppose .

Then

(congruent 's )

(congruent 's )

But

(angle sum of )



(angle sum of )

Grandad

ohhhhhhhhhhh , thanks !!!