They can be: acute, right angle, obtuse or reflex
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Each angle has a measure of 120 degrees
If you mean exterior angle is twice its interior angle then an equilateral triangle will fit the given description because each interior angle is 60 degrees and each exterior angle is 120 degrees
A parallelogram is a figure with different lengths and widths(also called breadth) where opposite sides and opposite angles are equal. But the angles are not 900 each. In fact, no angle in a parallelogram is a right angle as presence of 1 right angle proves all the angles to be right angles. A parallelogram with 4 right angles is called as a ''rectangle''
Total internal angles of an n-sided figure is (2n - 4)right angles Here we have (14 - 4)right angles = 10 x 90 degrees = 900 degrees, hence each angle would be 900/7 = 128.5714 degrees
The opposite angles are congruent and all add to 360 degrees