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two straight angles
Two lines but they can't be parallel. It would be better to say two rays that share the same endpoint form an angle. However, two intersecting lines form angles also. Two rays can form a 180 degree angle if they share the same endpoint and point in exactly the opposite directions. Two perpendicular lines can form a right or 90 degree angle.
You'll also need a protractor to construct a 220 degree angle which can then be bisected by means of a compass and a straight line to form two 110 degree angles.
A right angle triangle has one 90 degree angle and two acute angles
By a straight angle I assume you mean an 180° angle, so two angles that form a 180° angle would be called supplementary angles.