25. If ABC is an isosceles triangle and D is a point on BC such that AD I BC, then
(a) AB^2 – AD^2 = BD. DC
(b) AB^2 – AD^2 = BD^2 - DC^2
(C) AB^2 + AD^2 = BD. DC
(d) AB^2 + AD^2 = BD^2 – DC^2
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