We have 2 angles given DE and AD which is 53 and 90. we know AD is 90 because of the square thingy instead of the rounded line at the point the meet.
the total angle of this is 360 as its a full circle
ADBE is equal is 180 degrees to we can make an equation using that
90 + 53 + g = 180
143 + g = 180
g = 180 - 143
g = 37
Hope this helps :)
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