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1 Primary & Middle School Mathematics1–9 年级在线 2 High School Mathematics10–12 年级在线 3 University Mathematics — Year 1本科一年级在线 4 University Mathematics — Year 2本科二年级在线 5 University Mathematics — Year 3本科三年级在线

1 Primary & Middle School Physics1–9 年级在线 2 High School Physics10–12 年级在线 3 University Physics — Year 1本科一年级在线 4 University Physics — Year 2本科二年级在线 5 University Physics — Year 3本科三年级在线

1 School Chemistry — Grades 1 to 121–12 年级在线 2 University Chemistry — Year 1本科一年级在线 3 University Chemistry — Year 2本科二年级在线 4 University Chemistry — Year 3本科三年级在线

1 Primary & Middle School Biology1–9 年级在线 2 High School Biology10–12 年级在线 3 University Biology — Year 1本科一年级在线 4 University Biology — Year 2本科二年级在线 5 University Biology — Year 3本科三年级在线

1 Primary & Middle School Earth and Space Sciences1–9 年级在线 2 High School Earth and Space Sciences10–12 年级在线 3 University Earth and Space Sciences — Year 1本科一年级在线 4 University Earth and Space Sciences — Year 2本科二年级在线 5 University Earth and Space Sciences — Year 3本科三年级在线

1 Markets I: The Ecosystem and Exchange-Traded Markets市场在线 2 Markets II: Rates, FX and Credit市场在线 3 Markets III: Commodities, Energy and Crypto市场在线 4 Quantitative Methods方法在线 5 Derivatives and Volatility衍生品在线 6 Rates, Credit, XVA and Risk利率、信用与风险在线 7 Research Craft: Predictors, Backtests, Measurement, Portfolios研究在线 8 Strategies I: Equities and Futures策略在线 9 Strategies II: Volatility, Relative Value, Macro and the Bank Desks策略在线 10 Microstructure and Execution交易执行在线 11 Market Making and High-Frequency Trading做市在线 12 Machine Learning for Markets机器学习在线 13 Low-Latency Software技术在线 14 Networks, Hardware and Trading Infrastructure技术在线 15 Research, Data and Risk Platforms技术在线 16 The Desk and the Firm公司运营在线 17 The Industry: Firms, Roles and Careers职业发展在线 18 Interviews I: Maths, Probability and Speed职业发展在线 19 Interviews II: Markets, Trading Games and the Final Round职业发展在线 20 Interviews III: Code职业发展在线

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Mathematics · 术语表

什么是 Circle？

又称： diameter

Definition 26.6 Primary & Middle School Mathematics · 第 26 章 — Lines and Polygons

The circle of center $O$ and radius $3$ cm is the set of all points at exactly $3$ cm from $O$ . The compass draws it: spike on $O$ , opening $3$ cm, turn. A diameter is a segment through the center joining two points of the circle; it measures twice the radius.

示例

Example 26.7 (The compass as a distance-keeper)

The compass does more than draw circles: it transports distances. To mark all points at $4$ cm from a point $A$ , draw the circle of center $A$ , radius $4$ cm; to compare two segments without a ruler, open the compass on one and test it on the other.

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Definition 40.5 Primary & Middle School Mathematics · 第 40 章 — Lines, Circles and Angles

The circle of center $O$ and radius $r$ is the set of all points at distance exactly $r$ from $O$ . A segment from the center to the circle is a radius; a segment joining two points of the circle through the center is a diameter — its length is $2r$ ; a segment joining two points of the circle is a chord.

A circle with a radius [OM], a diameter [AB] (a chord through the center, twice as long as the radius) and a chord [CD]. — A circle with a radius $[OM]$ , a diameter $[AB]$ (a chord through the center, twice as long as the radius) and a chord $[CD]$ .

示例

Example 40.6

“Draw the circle of center $O$ passing through $A$ ”: open the compass from $O$ to $A$ — the radius is the distance $OA$ — and turn. Every point of this circle is at the same distance from $O$ as $A$ .

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