Question

Aflati masurile unghiurilor paralelogramului ABCD daca: m(B)=2•m (C)

Answer 1

Faci Trapezul...il notezi ABCD.....Duci inaltimea din B pe DC....notezi inaltimea cu E....ΔBEC dreptunghic.....m(∡E)+m(∡C)+m(∡B)=180°....m(∡E)=90°....90°+m(∡C)+2m(∡C)=180°....90°+3m(∡C)=180°....3m(∡C)=180°-90°....3m(∡C)=90°...m(∡C)=90°:3......m(∡C)=30°.....m(∡B)=2x30°....m(∡B)=60°.....