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Vertices of a variable triangle are (3,4...

Vertices of a variable triangle are `(3,4); (5costheta, 5sintheta)` and `(5sintheta,-5costheta)` where `theta` is a parameter then the locus of its orthocentre is a. `(x+y-1)^2+(x-y-7)^2=100` b. `(x+y-7)^2+(x-y-1)^2=100` c. `(x+y-7)^2+(x+y-1)^2=100` d. `(x+y-7)^2+(x-y+1)^2=100`

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