Thread: Circle Geometry

Hey guys

Two perpendicular chords AB and CD of a circle, centre O, intersect at E. Prove that + = 180 degrees.

Could someone please help me? I can't seem to work this one out.

Hello xwrathbringerx

Originally Posted by xwrathbringerx

Hey guys

Two perpendicular chords AB and CD of a circle, centre O, intersect at E. Prove that + = 180 degrees.

Could someone please help me? I can't seem to work this one out.

In :

(given)

(angle sum of triangle)

But (angle at centre = twice angle at circumference)

and (angle at centre = twice angle at circumference)



Grandad