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A, B, C and D lie on a circle in that order. ∠ABD is twice ∠DBC and ∠ADC = 105°. Find ∠DAC.

Competition practiceGeometry
  • A25°
  • B50°
  • C35°
  • D75°

Step-by-Step Solution

∠ABC = (opposite angles of a cyclic quadrilateral). With ∠DBC = and ∠ABD = ° and °. ∠DAC and ∠DBC stand on the same arc DC, so ∠DAC = 25°.
Answer: A) 25°

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