Reason 2: Definition of Midpoint
Note: The midpoint cuts the segment into two equal pieces
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Reason 3: Given. This is provided on the sheet.
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Reason 4: Vertical Angles
Note: Vertical angles are congruent.
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Reason 5: ASA congruence property
Note: ASA stands for "Angle Side Angle". Take note how the S is between the two A's.