the average of 3 angles of a quadrilateral which are in the ratio of 2;5;4 is 77.Find all the angle of the quadrilateral .
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let common factor be x
(2x+5x+4x)/3=77
11x = 77 × 3
x = 21
1st angle = 42⁰
2nd andle = 102⁰
3rd angle = 84⁰
4th angle = 360 -(42+102+84)
= 360⁰-228⁰
= 132⁰
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