Hey 1 ) True as Angle d and angle a are equal so we can put value of d as a. (VERTICALLY opposite angles) 2) YES it is also true as we can put angle d at PLACE of angle a and angles d, c,e form a LINE. 3) False as angle b + c = f + e ( Vertically opposite angles) .THEREFORE, b-f = e - c. Hope it helps :)
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