Question

find the angle 'a' in a quadrilateral with 4 angles 63°,78°,a°and 99°​

Answer 1

Answer:

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Sum of all angles of a quadrilateral=360°

63°+78°+99°+a= 360°

240°+a= 360°

a= 360-240

a= 120°

Answer 2

Answer:

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Sum of all angles of a quadrilateral=360°

63°+78°+99°+a= 360°

240°+a= 360°

a= 360-240

a= 120°