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The ratio of the angles ∠A and ∠B of a non-square rhombus ABCD is 4 : 5, then the value of ∠C is

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let the angle A be 4q

then angle b be 5q

now angle A= angle C ---------------opposite angle of rhombus are equal

and angle B= angle D ---------------opposite angle of rhombus are equal

since ABCD is a rhombus

So Angle A+B+C+D=360

4q+5q+4q+5q=360

18q=360

q=20

hence angle c is 80