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

User Ajay Poshak
by
7.6k 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
User Kerrine
by
6.9k points
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