Question

can anyone help me with this​

Answer 1

In order to prove that AB and CD

bisect each other at 0, it is sufficient

to prove that

∆AOD =~ ∆BOC

In these two triangles,

we have

AD = BC

∆OBC = ∆OAD {AD = BC and AB is

transversal }

so, by As A congruence criterion , we obtain

∆AOD =~ ∆BOC

= OA =OB and OD =OC=

AB and CD bisect each other at o.