1. Provide the reasons for the proof.
Given: Square ABCD, Diagonals and
Prove: Angle DEC and Angle BEC are right angles.
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B.) Is line DC = to line BC? What property of a square is shown?
C.) Is Line DE = BE? Which property of a parallelogram is shown?
D.) Angle DEC = BEC? Which triangle congruence postulate is there?
E. ) Is the Measurement of Angle DEC = to Measurement of angle BEC? Which definition of Congruence?
F.) Is angle DEC supplementary to angle BEC? Which postulate?
G.) Measurement of angle DEC + Measurement of angle BEC = 180 degrees? Which definition of supplementary angles is this?
H.) Measurement of angle DEC + Measurement of angle BEC = 90 degrees? Which substitution and division property of equality?
I.) If Angle Dec and Angle BEC are right angles which definition of a right angle are they?