Question

1. In quadrilateral ABCD, angel A:angleB:angleC:angleD = 4:5:4:5. Find
all the angles of quadrilateral ABCD and state the type of
quadrilateral ABCD.
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Answer 1

here is your answer mate.....

let them be 4x, 5x, 4x, 5x

adding them will give 360°4x+4x+5x+5x= 360°

then

18x= 360°

x = 360/18= 20

then angles are 80°,100°,80°,100°

although opposite angles are equal then it is a RHOMBUS