garydesir1
garydesir1 garydesir1
  • 24-07-2017
  • Mathematics
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Hey there! I would like some help please :) Thanks!

Hey there I would like some help please Thanks class=

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Banabanana
Banabanana Banabanana
  • 24-07-2017
AC is a common side, ∠ACD = ∠ACB and CD = BC   ⇒ ΔACD and ΔABC are congruent (SAS definition).

Congruent triangles have exactly the same three angles, so ∠D = ∠B.
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