Math, asked by shaurya447636, 7 months ago

Q.4 In the given fig, find the value of a+b
128°
P
S
a
R​

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Answers

Answered by abhijeet123289
0

Answer:

∠ABP=85(Given)

∠AOB=2(∠ABP)(Angleincribedbycentreofcircleisdoubleangleinscribedbyanychord)

∠AOB=2×85=170

In△AOB

SinceOA=OB(Oiscentreofcircle)

∠OAB=∠OBA(Anglealongtheequalsideareequal)

Hence∠OAB+∠OBA+∠AOB=180

∠OAB+∠OBA=180−170=10

Hence∠OAB=∠OBA=5

∠OAB=a=5

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