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How to find the missing angle of this quadrilateral if the other angles are 108 degrees, 99 degrees, and 78 degrees?

How to find the missing angle of this quadrilateral if the other angles are 108 degrees, 99 degrees, and 78 degrees?
asked 230k views
5 votes
How to find the missing angle of this quadrilateral if the other angles are 108 degrees, 99 degrees, and 78 degrees?

asked
User Ajay Poshak
by
8.2k points

1 Answer

4 votes
alll angles in a quadrilateral add to 360

so
missing angle=x
108+99+78+x=360
285+x=360
minus 285 from both sides
x=75


missing angle is 75 degrees
answered
User Kerrine
by
7.8k points
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