1 Answer

Pseudosavant · Answer 1 · 2024-05-28T14:29:10+0000

Answer:

Explanation:

Angles in a quadrilateral add to 360°. So

60+80+120+x=360 (where
is the fourth angle)

260+x=360

x=100 ° (after subtracted 260 from both sides of equation)

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