单词	circle
释义	circle A closed curve every point on which is a fixed distance (the radius ) from a point (the centre ) within the curve (see illustration). The diameter is a line that joins two points on the circumference and passes through the centre: the diameter is twice the radius (r). The circumference of a circle is equal to 2πr; the area is πr2, where π is a constant with the value 3.141592. In analytical geometry the equation of a circle, centred at the origin, is x2 + y2 = r2. A circle
随便看	cross product cross section crucible cryogenic pump cryogenics cryohydrate cryometer cryoscopic constant cryostat cryotron crystal crystal counter crystal defect crystal habit crystal lattice crystal microphone crystal oscillator crystal pick-up crystal structure crystal system crystallography crystalloids CT scanner cubic crystal cubic equation

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