Check whether two given lines are orthogonal or not.
Two lines are orthogonal if they create a right angle at their intersections.
here (x1,y1) and (x2,y2) form a line.
Doubling elements in a vector
Matrix rotation as per given angle
Calculate area of sector
NaN (欠損値) が含まれている行を削除しよう
Fault in our Stars - 02
ZigZag - 02
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