ordinate纵坐标
numberline数轴
quadrant象限
slope斜率
complex plane复平面
8.其它
plane geometry平面几何
trigonometry三角学
bisect平分
circumscribe外切
inscribe内切
intersect相交
perpendicular垂直
pythagorean theorem勾股定理
congruent全等的
multilateral多边的
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