Sakurichu Sakurichu
  • 01-09-2020
  • Mathematics
contestada

I really need help on this. >.

I really need help on this gt class=

Respuesta :

jimrgrant1 jimrgrant1
  • 01-09-2020

Answer:

∠ D = 48°

Step-by-step explanation:

Since AC ~ BC then Δ ABC is isosceles and the base angles are equal, thus

∠ B = ∠ C = 69°, then

∠ ACB = 180° - (69 + 69)° = 180° - 138° = 42° ( sum of angles in Δ )

∠ DCE = ∠ ACB = 42° ( vertical angles )

∠ D = 180° - (90 + 42)° = 180° - 132° = 48°

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