Step-by-step explanation:
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Answer:
The two angles ADB and BDC are congruent since they are both right angles.
The segment AD and CD are congruent since D is the midpoint of AC.
Segment BD is in common for the two triangles.
The triangles ABD and BCD are congruent by SAS. In particular, Angle A is congruent to angle C (they are opposite to congruent sides), QED
The diagonal (hypotenuse) is 13 in.
You need to use the Pythagorean Theorem

then just plug in the numbers and solve for c.


13 = c