What is the relation between ˆBC and ˆAD?
ˆBC=ˆAD
Given: ∠AOB=90∘
∠COD=90∘
Now, ∠BOC=180−∠AOB=180∘−90∘=90∘
and ∠AOD=180−∠COD=180∘−90∘=90∘
⇒ˆBC subtends 90∘ at the centre and ˆAD also subtends 90∘ at the centre.
We know that equal arcs subtends equal angles at the centre,
so, ˆBC=ˆAD