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can you just say this? i understand but i don't think its clear enufOriginally posted by GuardiaN
oh the first one is easy.
there is a rule that you are allowed to state in the HSC that says that perpendiculars to tangents to a circle pass through the centre. Therefore any two parallel tangents' perpendiculars will meet at the centre, forming a straight line.
erm, yes and no, i need to prove one pair of sides equal but i can'tOriginally posted by GuardiaN
second one also seems easy. here goes:
use the fact that any two tangents drawn to a circle from one external point makes both tangents equal from point of contact to point. gee, how vague. Hope you see what i mean.
and you know they are parallel. therefore opposite sides are parallel and equal. go figure it out, very easy
don't you have to mention the fact that the two perpendiculars to form a straight line, they must be co-interior. Then you have to mention that they are co-interior by mentioning that the angles they make(to the perpendicular) sum to 180. then you say what you said earlier? wrong?Originally posted by GuardiaN
your allowed to say it.why not? its a rule that you are allowed to state. Just word it differntly if you want, but thats the gist of it.