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Garis singgung pada lingkaranx²+y²= 1 , dititik (0,2)
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titik (0,2) diluar lingkaran, garis kutubnya x1x + y1y = r²
0x + 2y = 1 --> y = 1/2
substitusikan kelingkaran x² + y² = 1 --> x² + 1/2² = 1
x² = 3/4
x = - 1/2 √3 atau x = 1/2 √3
titik singgung -> x = - 1/2 √3, y = 1/2
pgs --> x1x + y1y = r² --> -1/2 √3 x + 1/2 y = 1 --> -√3 x + y = 2
atau y = x √3 + 2
titik singgung -> x = 1/2 √3 , y = 1/2
pgs--> 1/2 √3 x + 1/2 y = 1 --> x√3 + y = 2
atau y = - x√3 + 2