Question

Fie Abcd paralelogram si masura lui A=30 grade. Adlati masura lui ABC si masura lui BCD

Answer 1

∡BCD≡∡DAB⇒ ∡BCD=30°
∡ABC=180°-∡DAB=180°-30°=150°

Answer 2

ABCD paralelogram => ∡A+∡B(∡ABC)=180°=>∡ABC=180°-30°=150°

ABCD paralelogram => ∡A≡∡C(∡BCD)=>∡BCD=30°