shazzzzzzzzzzzz shazzzzzzzzzzzz
  • 13-06-2021
  • Mathematics
contestada

Pls help me with this equation

Pls help me with this equation class=

Respuesta :

jimrgrant1 jimrgrant1
  • 13-06-2021

Answer:

x = 20

Step-by-step explanation:

Given BD = CD then Δ BCD is isosceles and the 2 base angles are congruent

∠ CBD = ∠ BCD = 40° , then

∠ BDC = 180° - (40 + 40)° = 180° - 80° = 100° ← sum of angles in triangle

Sum the 3 angles of Δ ACD and equate to 180

20 + 100 + x + 40 = 180

160 + x = 180 ( subtract 160 from both sides )

x = 20

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