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Given: line AB is congruent to line CD and line AD is congruent to line BC. Prove: angle D is congruent to angle B

Given: line AB is congruent to line CD and line AD is congruent to line BC. Prove-example-1

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AD = BC ----> Parallel lines
AC = AC -----> Reflexive property
<A = <C -----> Congruent angles
<D = <B -----> Congruent angles
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