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Trigoman · Answer 1 · 2019-11-13T03:55:57+0000

Sum of interior angles is 180deg

So we have 180-90-40=50deg for the unknown angle
Then we have -10+5x=50 and solving for x we get;
5x=60 x=12
So x=12 and the missing angle is 50deg

Any questions please just ask. Thanks.

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