10) Two angles in a triangle are in the ratio 4:5. If the difference of these angles is equal to one
ninth of third angle, then the third angle is ....
A) 180°
B) 40°
C) 50°
D) 90°
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1st angle =4x
2n angle=5x
A.t.Q
5x-4x=1/9third angle
it means third angle =9x
sum of all angle is equal to 180
so, 4x+5x+9x=180
18x=180
x=180/18
x=10
so,third angle =90
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