Respuesta :

Answer:

See below ~

Step-by-step explanation:

Finding m∠R

  • ∠A + ∠R = 180°
  • 90° + ∠R = 180°
  • ∠R = 90°

Finding m∠D

  • ∠C = 360° - 100° - 40° / 2
  • ∠C = 220°/2 = 110°
  • ∠C + ∠D = 180°
  • 110° + ∠D = 180°
  • ∠D = 70°

Opposite angles of an inscribed quadrilateral is supplementary

  • m<A+m<R=180
  • 90+m<R=180
  • m<R=90°

mCR=100°

  • 2<C=360-40-100=360-140=220
  • <C=110°

m<D+m<C=180°

  • m<D=180-110=70°

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