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Which is the key to solving triangles? ⊾1+⊾2+⊾3=360 ⊾1+⊾2+⊾3=90 ⊾1+⊾2+⊾3=180 ⊾1+⊾2+⊾3=45 27o c 58o c= c=x+33 a=2x+17 b=3x+22 a b c x= 18 a= b= c= a c=x+25 b=x+20 a=x+15 b c a= x= b= c= 115 a c b a= b= 120 c= 100o b=3x c=2x a b c a= x= b= c= a a=7x+10 b=2x+17 b x= a= b= a=2x b=5x+59 c=3x+1 a b c x= a= b= c= 33o 41o c 71o b c= b= x x x x= |