In the given figure, OC and OE are the bisector of ∠DOB and ∠AOD respectively. Then find the measure of ∠EOC.
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Solution
Since OC bisects ∠DOB. ∴∠DOC=∠COB=∠DOB2 …..(i)
Similarly, OE bisects ∠AOD. ∴∠AOE=∠EOD=∠AOD2 …..(ii)
Now, ∠EOC = ∠EOD + ∠DOC =∠AOD2+∠DOB2 [From (i) and (ii)] =12(∠AOD+∠DOB) =12×180∘(∵∠DOBand∠AOD from a linear pair) =90∘
Hence, the required measure of ∠EOC is 90∘