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	Schrödinger equation Schrödinger's cat Schrödinger, Erwin Schwarzschild radius Schwinger effect scintillation camera scintillation counter sclerometer scotopic vision screen grid screw seaborgium search coil Searle's bar second secondary cell secondary colour secondary emission secondary winding secular magnetic variation sedimentation Seebeck effect Seger cones Segrè plot seismic waves

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