| 摘要 |
<p>The present device relates to an educational clock having exchangeable parts, comprising: a base plate provided with a time display part for displaying a time, or an angle display part for displaying an angle; a polygonal auxiliary plate coupled to the upper side of the base plate; and an hour hand and a minute hand rotating along the upper face of the auxiliary plate for displaying a time or angle, wherein the hour hand and the minute hand can be exchanged through the upper side of the auxiliary plate. In the present device, the educational clock has a variety of polygonal auxiliary plates and polygonal pieces so that the present device has advantages of being capable of observing various polygonal shapes in the educational clock, and achieving more varied kinds of education by calculating interior angles of the polygons or comparing the interior angles with an angle between the hour hand and the minute hand.</p> |
