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We know that
any angle in semicircle is of 90 degree
<P + <Q + <R = 180
2<Q + <Q + 90=180
3<Q=90
<Q = 60
<P =120
any angle in semicircle is of 90 degree
<P + <Q + <R = 180
2<Q + <Q + 90=180
3<Q=90
<Q = 60
<P =120
sk5075455:
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