Using line and angle theorem, we can establish that right angles are congruent. The missing statement are :
- definition of the midpoint of the line BD
- △ BCA ≈△DCA
The midpoint of the line BD is the point C.
Hence, the distance between the point BC and CD is the same ;
Hence, BC ≈ CD (definition of the midpoint of the line BD)
2.)
The statement which establishes the reason given that all right ∠s are ≈ the fact that △ BCA is congruent to △DCA.
Therefore, △ ACB ≈ △ACD
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