Circle Geo Chord (1 Viewer)

[kazemagic]

So for this question can I say:
Drop a line OC perpendicular to AB
AF = CA - CF
GB = CB - CG
CA = CB (perpendicular from centre to chord bisects it)
CF = CG (perpendicular from centre to chord bisects it)
Therefore GB = AF

I just want to make sure that its right >.> cos cambridge used a different method

Thanks

 

[Carrotsticks]

So for this question can I say:
Drop a line OC perpendicular to AB
AF = OA - OF
GB = OB - OG
OA = OB (perpendicular from centre to chord bisects it)
FO = OG (perpendicular from centre to chord bisects it)
Therefore GB = AF

I just want to make sure that its right >.> cos cambridge used a different method

Thanks

I don't understand how you got this part.

Also, what did you mean by 'cambridge used a different method'? iirc they don't have worked solutions.

 

[Kurosaki]

Aren't OA and ob radii?

 

[Kurosaki]

Dude just do perpendicular to chord bisect so, drop oc to ab, the n ca=cb and u can work the rest out
After using perpendicular to chord bisect one more time

 

[kazemagic]

I don't understand how you got this part.

Also, what did you mean by 'cambridge used a different method'? iirc they don't have worked solutions.

woops i meant AF = CA - OF
EDIT: I meant CA - CF

Yea for this there was like a small worked solution where they used congruent triangles proved by SAS

 

[Kurosaki]

Yes it's right why the many typos though lol.

 

[kazemagic]

Dude just do perpendicular to chord bisect so, drop oc to ab, the n ca=cb and u can work the rest out
After using perpendicular to chord bisect one more time

yea i did that but wasnt sure if it was right lol

 

[Nooblet94]

woops i meant AF = CA - OF
EDIT: I meant CA - CF

Yea for this there was like a small worked solution where they used congruent triangles proved by SAS

I would've used AAS...

 

[Kurosaki]

yea i did that but wasnt sure if it was right lol

Sorry I didn't understand cuz u put O instead of C for all those lengths haha

 

[kazemagic]

I would've used AAS...

oh yea i think they did use AAS
did this question in the morning so my memory has gone hazy

 

[kazemagic]

Sorry I didn't understand cuz u put O instead of C for all those lengths haha

yea that was my bad i only realised it after u guys posted
dunno wat i was thinking that time =.=

 

[Kurosaki]

Of=og
OA=ob
Angle GAO=angle gbo Isos triangle
Therefore SAs