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Jumlah seluruh sudut sgitiga =180'
Jumlah seluruh
180'=<P+<Q+<R
180'=90'+(16+x)'+x'
180'-90'=16'+2x
90'=16'+2x'
90'-16'=2x'
74'=2x'
74'/2=x
x=37'
<Q=16+37
<Q=57'
<R=37'