1. In the given figure. AOB is a straight line. Find the measure of
A
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1. In the given figure. AOB is a straight line. Find the measure of
A
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Answer:
AOB is a straight line
∴∠AOC+∠COD+∠DOB=180
∘
⇒x+20
∘
+2x−20
∘
+60
∘
=180
∘
⇒3x=120
∘
⇒x=40
∘
∠COD=2x−20
∘
=(2×40
∘
)−20
∘
=60*