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<p>Besar sudut garis lurus ( &lt; PQS ) = 180°</p><p>Diketahui :</p><p>&nbsp; • Sudut PQS = 180°</p><p>&nbsp; •Sudut SQR = 45°</p><p>Dicari : Besar sudut PQR = ........?</p><p>Dijawab : &lt;PQS = &lt; SQR + &lt;PQR</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;180° = 45° + X</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; X &nbsp;= 180° - 45°</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;X = 135°</p>