问题1：填空
(i)圆的中心位于圆的____________。 (外部/内部)
Answer: Interior.
(ii)与圆心的距离大于其半径的点位于圆的______________。 (外部/内部)
Answer: Exterior.
(iii)圆的最长和弦是圆的______________。
Answer: Diameter.
(iv)圆弧的末端是直径的末端时，它是_____________。
Answer: Semicircle.
(v)圆的段是圆弧与圆的_____________之间的区域。
Answer: Chord.
(vi)圆将它所在的平面分成_______________个部分。
Answer: Three.
问题2：写对还是错：给出回答的理由。
(i)将中心连接到圆上任何点的线段是圆的半径。
Answer: True, Any line segment drawn from the centre of the circle to any point on it is called raidus of the circle and will be of equal length.
(ii)一个圆只有相等数量的相等和弦。
Answer: False, There can be infinite number of equal chords in a circle.
(iii)如果一个圆被分成三个相等的弧，则每个弧都是一个主弧。
Answer: False, When the arcs are not equal we will have major and minor arc, equal arcs cannot be classified as a major arc or a minor arc.
(iv)圆形的弦长是其直径的两倍，其半径是其半径的两倍。
Answer: True, Diameter is the longest chord of the circle and the length of the longest chord in a circle is twice the length of radius of the circle.
(v)扇形是指和弦及其对应弧之间的区域。
Answer: False, Sector is defined as the region between the arc and 2 radii of the circle.
(vi)圆是平面图
Answer: True, A circle is a 2D figure which can be drawn on a plane.