ahadthebestt
ahadthebestt
24-02-2018
Mathematics
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SilverSister
SilverSister
24-02-2018
The sum of the interior angles of a quadrilateral is 360 degrees.
x + 2x + 145 + 80 = 360
3x = 135
x = 45
∠S is 2x, which is 90 degrees
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