Answers

2014-03-21T17:45:19+05:30
The answer is 80 degrees

9x=180
x=20

A=C=20*4=80
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2014-03-25T09:33:58+05:30
The ratio of angle A and angle B is 4:5
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
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