estimate - 估算, whole number, integer - 整数, central angle - 圆心角, decimal - 小数, fraction - 分数, numerator - 分子, denominator - 分母, product - 积, multiplication - 乘法, subtract, subtraction - 减去, 减法, divide, division  - 分式，除法, multiply - 乘, azimuth - 方位角, centimeter - 厘米, reciprocal  - 倒数, dividend  - 被除数, divisor - 除数, ratio - 比值, radius, radii - 半径, diameter - 直径, pattern - 规律, pi - 圆周率, circumference - 周长, area - 面积, annulus - 圆环, circular sector - 扇形, arc - 弧, percentage - 百分率, bar graph - 条形统计图, line graph - 折线统计图,

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