AOB is straight line. The value of ∠AOP is ___.
70∘
110∘
60∘
120∘
Since AOB is straight line,
∠AOP+∠BOP=180∘ (Linear pair)
ie, x+20∘+x−20∘=180∘
⇒2x=180∘
⇒x=90∘
∴∠AOP=x+20∘=90+20=110∘
AOB is straight line. Then, find the value of ∠AOP.