right angle - an angle that is 90 degrees, obtuse angle - an angle that is greater than 90 degrees (bigger than a right angle), acute angle - an angle that is smaller than 90 degrees (smaller than a right angle), anti-clockwise - to move around in the opposite direction of a clock, clockwise - to move around in the direction of a clock, angle - when 2 straight lines meet, vertical line - a line that goes straight up, horizontal line - a line that goes straight across,

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