How can tartar and plaque be removed from teeth without grinding? is there any paste, etc. for it?
The girders of a suspension bridge form an arc. The definition of an arc is a curve or bowed shape, like a part of a circle. An example of an arc is a rainbow. To arc is defined as to make a curved shape or move in a curved path.
The length of an arc is the distance along the curved line forming the arc. It would be measured in distance units, such as meters. To indicate this measure, the arc is preceded by the lower case letter L (for 'length'). For eaxmaple would be read as the length of the arc AB is 6 inches.