Pentagon, 五边形, Hexagon, 六边形, Heptagon, 七边形, Octagon, 八边形, Nonagon, 九边形, Decagon, 十边形, Parallel sides, 平行边, Right angle, 直角, Acute angle, 锐角, Obtuse angle, 钝角, Regular polygon, 正多边形, Area, 面积, Formula, 公式, Base, 底边, Height, 高度, Square area formula, 正方形面积公式, Rectangle area formula, 长方形面积公式, Triangle area formula, 三角形面积公式, Parallelogram area formula, 平行四边形面积公式, Trapezoid area formula, 梯形面积公式.
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