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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