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AD and BC are equal perpendiculars to a...

AD and BC are equal perpendiculars to a line segment AB (see Fig. 7.18). Show that CD bisects AB.

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Consider two triangles `△ BOC` and `△ AOD`,
In `△ BOC` and` △ AOD`,
`∠BOC = ∠AOD` (Vertically opposite angles) ...
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