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??1? ABCD 3????2??????AB?CD????( )?.
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19.???EF?AD??1 =?2??BAC = 70????AGD????????
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20. ??9????????4cm?
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A.?A+?E+?D=180B.?A??E+?D=180C.?A+?E??D=180D.?A+?E+?D=270
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17. ??????AB?CD?EF????O?AB?CD?OG???AOE??FOD = 28o???BOE =???AOG =?. 18. ????AB?CD??BAE = 120o??DCE = 30o???AEC = .
19. ???????????????????????AOB?= 70o???OGC = 20. ???????ABCD??M?DC???BM = 10?N?AC??????DN + MN?????.
21. ?????????30cm??????????120???????????A??????cm ?
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?C????AB?CD???????EF?EG??????EFG??????AD=2cm?BC=8cm??FG
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23. ??9????1=40??2=100????3???????
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25. ?????a?b???c????a//b???1=118??2?????
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27 ??:??,DA?AB,DE???ADC,CE???BCD, ??1+?2=90.???BC?AB?????????
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发表于 2019-9-13 23:46:11