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60°
Step-by-step explanation:
As ∆ABC and ∆A'B'C' is concurrent
3x = 2x + 20
3x - 2x = 20
x = 20
Now, we have the value of x
so, substitute in - 2x + 20
2x + 20
2(20) + 20
40 + 20
60°
Hope this helps u
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