92 = 81 and 102 = 100
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The sum of the internal angles of a hexagon is (6-2)*180 = 720 degrees The four given angles add up to 53 + 126 + 89 + 117 = 385 degrees So the remaining two add up to 335 degrees.
A pentagon.
It is an acute angle
An acute angle
There are three angles in a triangle that amount to 180 degrees. If one of these angles was 91 degrees (an obtuse angle) then the sum of the other two angles must be 89 degrees.