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ITMC 2018 Grade 6 National Preliminary set01 Question 4

ITMC · ITMC 2018 Grade 6 National Preliminary set01

Question 4

In triangle $ABC$, extend $BC$ through $C$ to $D$. Angles $a,b,c,d$ are shown. Find $a+b+c+d$.

Question illustration
  1. $180^\circ+a+b$
  2. $360^\circ$
  3. $180^\circ-a$
  4. $180^\circ$
  5. None of these