The tangent equation of over current M (3,4) and square of circle x + square of y = 25

Because the point m (3,4) is on the circle, there is only one tangent line passing through M. conclusion m (x0, Y0) is on the circle x &# 178; + y &# 178; = R &# 178; then the equation of tangent line passing through M is x0x + y0y = R &# 178; the answer is 3x + 4Y = 25, that is, 3x + 4y-25 = 0

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