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In a triangle ABC ANGLE B …

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In a triangle ABC ANGLE B =2ANGLE C, AD IS THE ANGLE BISECTOR OF ANGLE A . AB=DC. PROVE THAT ANGLE A = 72°
  • 2 answers

Alex De Marx 5 years, 1 month ago

In triangle ADC, AD=DC HOW YOU ABLE TO SAY

Gaurav Seth 5 years, 1 month ago

Triangle ABC and ADC are similar (two sides and one angle is equal)

So ∠ CAD = ∠ ACB = C

∠BAC = 2c

And in triangle ABC ∠BAC + ∠ABC + ∠ACB 

= 2c+2c+c 

= 5c 

= 180c

= 180/5 

= 36

∠BAC = 2c

= 2x36 

= 72

OR

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