POQ is a line. Ray OR is perpendicular to line PQ. OS isanother ray lying between rays OP and OR. Prove that∠ROS = 1/2(∠QOS −∠POS)
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given,
qr ⊥ pr
to prove,
∠ros=1/2(∠qos-∠pos)
PROOF: ∠por=90
⇒∠pos+∠sor=90
⇒∠ros=90-∠ pos---------------(1)
∠qor=90(∵qr⊥pr)
⇒∠qos-∠ros=90
⇒∠ros=∠qos-90--------------------(2) from (1) and(2)we get,
∠ros+∠ros=90-∠pos-90+∠qos
⇒2∠ros=∠qos-∠pos
⇒∠ros=1/2(∠qos-∠pos)
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