20.用三根同样长的铁丝,分别为成一个圆、一个长方形和一个三角形,围成的( )面积最大.
0 154827 154835 154841 154845 154851 154853 154857 154863 154865 154871 154877 154881 154883 154887 154893 154895 154901 154905 154907 154911 154913 154917 154919 154921 154922 154923 154925 154926 154927 154929 154931 154935 154937 154941 154943 154947 154953 154955 154961 154965 154967 154971 154977 154983 154985 154991 154995 154997 155003 155007 155013 155021 199269
| A. | 三角形 | B. | 圆 | C. | 长方形 |