Some of them do.
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Only when it is an isosceles trapezoid.
If triangle has one obtuse angle other two angles are acute. Since, sum of angles of triangle is 180.
yes
Assuming that neither of the given sides is the hypotenuse, then if A is one of the acute angles, tan(A) = 19/63 So A = arctan(19/63) = 16.8 degrees. The other acute angle is 73.2 deg.
Acute angles are greater than 0 but less than 90 degrees Obtuse angles are greater than 90 but less than 180 degrees Reflex angles are greater than 180 degrees but less than 360 degrees