锐角和钝角-(PPT课件).ppt

N H A1 12 23 34 45 56 67 78 89 91010111112121 12 23 34 45 56 67 78 89 91010111112121 12 23 34 45 56 67 78 89 91010111112121 12 23 34 45 56 67 78 89 91010111112127:001:009:301 12 23 34 45 56 67 78 89 91010111112121 12 23 34 45 56 67 78 89 91010111112121 12 23 34 45 56 67 78 89 9101011111212v直角+锐角=v锐角锐角v直角直角v钝角钝角 v锐角+锐角=v锐角锐角v直角直角v钝角钝角