Question

if opposite angles of a rhombus are (2x) & (3x-40) then value of x is

Answer 1

opposite angles of a rhombus are congruent
$2x = 3x - 40 \\ 40 = 3x - 2x \\ x = 40$
2x=2×40 = 80°
3x-40= 120-40=80°
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Answer 2

Here is your answer

2 X + 3 x minus 40 is equals to 180 degree

5x-40= 180

5x=180-40

5x= 140

x = 28