Question

HELPPPPPP PLEASEEE! Question is put in an attachment.

Answer 1

The quadrilateral is two isosceles triangles. Angle bisectors are diagonals, and angle bisectors of such triangles are also altitudes and perpendicular bisectors.

Answer 2

how do i write this in "proven and given" form??

Answer 3

Given the shape, AD and AB are equal in length. DC and BC are equal in length.

So, ABD and CDB form two isosceles triangles.

Because of that, the altitudes of these two triangles bisect line DB. Altitudes are perpendicular lines, so, DB and AC are perpendicular.