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Not sure what congruent rule I'm meant to use

 Oct 4, 2018
 #1
avatar+99659 
+2

Mmmm.....I''m not sure  what "RHS" means,  either...but...here's a proof

 

BD  = CA   [ diameters of a circle are equal ]

Central Angle BOA  = Central Angle COD  [ vertcal  angles are equal ]

Chord BA  =  Chord CD  [ equal central angles span  equal chords  ]

AD = AD    [ reflexive property ]

 

So  BD = CA, BA = CD  and AD =AD

 

So...by S-S-S   triangle ABD  is congruent to  triangle DCA

 

 

cool cool cool

 Oct 4, 2018

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