Answers

2 - Column Proof

Missing were:

~ Reason 12 -- Substitution

~ Reason 13 -- Side-Angle-Side Conjecture

~ The column heading -- Statement

~ The column heading -- Reason

~ The mistake in the proof was 2x+7 = 3x-9.  (You can find it by looking at the given and comparing it to                             Statement 3.)

Paragraph Proof

Missing were:

~ Our given is kite ABCD (or any other consecutive vertices)

~ ...= 90º because of the definition of a right angle

~ Isosceles Triangle Median, Altitude, and Angle Bisector Conjecture

~ The mistake here was the fact that Segment AC was the perpendicular trisector of Segment BD,                             not the perpendicular bisector, like it should have said.

~ "QED" or the "box-slash-slash"

Flowchart Proof

Missing were:

~ The Arrow from Box 1 to Box 4

~ The Arrow from Box 1 to Box 9

~ The Arrow from Box 2 to Box 5

~ The Arrow from Box 5 to Box 6

~ The Arrow from Box 4 to Box 6

~ The Arrow from Box 6 to Box 7

~ The Arrow from Box 7 to Box 8

~ The Arrow from Box 8 to Box 9

~ The Arrow from Box 9 to Box 10

~ The "QED" or the "box-slash-slash"

Contradiction Proof

Missing were:

~ Assume the opposite of what we?re trying to prove is true.

~ m<OBA = m<OBC = 90º

~ Since we argued logically, our assumption must be false, and the opposite must be true.

~ Therefore, Segment OA is perpendicular to Segment DA.

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