Circle geometry? (1 Viewer)

[jstalexx]

could you help me with this question please? =)

AB is a diameter of a circle and BC is a diameter of another circle. Prove that ABC is collinear.

 

[Pwnage101]

you're in the wrong forum

circle geo is strictly 3U

 

[Aerath]

I'm not sure if I've done it right, but, from my diagram, if you draw a tangent XY to both circles, you know that the diameter from a circle, touches the tangent at right angles. Therefore, if you have two right angles, therefore, you have a 180* line, which shows that it's straight (or collinear).

 

[lyounamu]

I'm not sure if I've done it right, but, from my diagram, if you draw a tangent XY to both circles, you know that the diameter from a circle, touches the tangent at right angles. Therefore, if you have two right angles, therefore, you have a 180* line, which shows that it's straight (or collinear).

Yep. That's the way.