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sudut q disegitiga= 180-(45+55)
180 - 100
80
sudut rqs : 180-80
100
<P = 45'
<R = 55'
besar <RQS adalah
<P + <R + <Q = 180'
45' + 55' + <Q = 180'
100' + <Q = 180'
<Q = 180' - 100'
<Q = 80'