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Answer :

`(|Ax_(1) + By_(1) + C|)/(|A "cos" alpha +B "sin" alpha|)`Solution :

Line is passing through the point P`(X_(1), Y_(1))` and making an angle `alpha` with x-axis. <br> One of the points on the line at distance r from the point P is given `(x_(1)+r "cos" alpha, y_(1) +r "sin" alpha)`. <br> If this point id Q, then it lies on the line. So, A`(x_(1) +r "cos" alpha) +B(y_(1) +r "sin" alpha) +C=0`. <br> `therefore r = (|Ax_(1) +By_(1)+C|)/(|A"cos" alpha + B"sin"alpha|)`