Question

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Dau coroană.​

Answer 1

Răspuns:

a) 1. AB≡DC, BC║AD, CD≡AB

  2. ∠A≡B,D,C ∠B+∠C=∠A

  3. AO≡OC, BO≡OD

b) 1. P= 2(4cm+ 3cm)=2×7cm=14cm(perimetrul palelogramului)

   2. m(∠C)=m(∠A)=60°

   3. m(∠B)=m(∠D)⇒60°+60°=120°⇒180°+180°=360°⇒360°-120°=240°⇒240°-180°=60°⇒∠B=120°