Right angle, angle whose measurement is equal to 90 degree., Acute angle, angle whose measurement is between 0 degree to 90 degree., Straight angle, angle whose measurement is equal to 180 degree., Obtuse angle, whose measurement is between 90 degree to180 degree., Zero angle, angle whose measurement is equal to 0 degree., Angle, two rays with the same end point., Triangle, there are three angles in this closed figure., Rectangle, there are four angles in this closed figure., Arms, the two rays joining to form an angle., 360 degree, the sum of the interior angles of a rectangle.

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