Question

problema de geometrie cine stie

Answer 1

A O B  sunt colineare ⇒egale cu 180°
∡AOB=∡AOC+∡COB=180°
stim ca 5m∡AOC=4m∡COB⇒m∡AOC=4/5m∡COB
inlocuind obtinem: 4/5m∡COB+m∡COB=180°
4m∡COB+5m∡COB=180°*5
9m∡COB=180*5 impartim la 9⇒m∡COB=20*5=10°
intersectie a doua drepte formeaza unghiuri la varf egale doua cate doua si cum suma unghiurilor in jurul unui pct.este de 360° rezulta
360°-2*100°=2m∡BOD⇒2m∡BOD=160°⇒m∡BOD=80°