arc subtended by a chord
... camel back top chordn.驼背上弦杆 arc subtended by a chordn.对弦弧 cascadepitch-chord ration.叶栅的栅距弦长比,相对栅距 ...
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等弦对等弧 equal chord, equal arc
等弧对等弦 equal arc, equal chord
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弦的垂直平分线经过圆心，并且平分弦所对的两条弧。
A perpendicular bisector of a chord passes through the centre and bisects the arc.
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