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The circles x^2+y^2 +2x +4y-20=0 and x...

The circles `x^2+y^2 +2x +4y-20=0` and `x^2 +y^2 + 6x-8y + 10 = 0` a) are such that the number of common tangents on them is 2 b) are orthogonal c) are such that the length of their common tangents is `5(12/5)^(1/4)` d) are such that the length of their common chord is `5sqrt3/2`

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