two adjacent angles of a parallelogram are in the ratio 4:5 find the measure of all angles
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given ratio is 4:5
let angles be 4x,5x
so 4x +5x = 180
9x = 180
x = 20
so these angles are 80,100 degrees
let angles be 4x,5x
so 4x +5x = 180
9x = 180
x = 20
so these angles are 80,100 degrees
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