first the top missing angle|60°+50°-180°|=|110°-180°|=70°
next the right center missing angle|110°-180|=70°
now the left unknown inside angle|70°+70°-180°|=|140°-180°|=40°
now the outer missing|40°-180°|==140° and subsequently the answer
2026-10-04 08:07:07
17
Giang Son :
x = 10
2026-10-04 12:21:22
0
tatsuhirosato178 :
There’s 2 things to remember here: 1) opposite angles created by intersecting lines are equal, & 2) all angles within a quadrilateral add up to 360. Ok let’s break it down… x=360-110-60-50=140… x = 140