| 60( ” )秒seconds = 1( ’ )分minute
60( ’ )分minutes = 1(°)度degree
90(°)度degrees = 1/4圈或直角quadrant or right angle (L)
360(°)度degrees = 壹圓圈(圓周)circle or circumference
圓的直徑the diameter of a circle =通過圓心的直線
the straight line passing through its centre
圓的半徑the radius of a circle =直徑the diameter÷2
圓周the circumference of a circle =直徑the diameter x 22/7
|