Question 402663
The ratios are 5:6:9

The total parts will be 5+6+9=20

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The sum of angles of triangle = 180 deg.
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the first angle is 5/20 * 180 =45 deg

The second angle = 6/20*180=54 deg

The third angle = 9/20*180=81 deg.

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CHECK
45+54+81= 180

Divide by 9

5:6:9