如图,平行四边形abcd中,bc=2ab,e为bc中点,求角AED的度数.请在今晚前答复.再问几道英语题:1.翻译词组:保守秘密2.surprise的形容词3.They're interested in watching football.(同义句) They () () in watching footb
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如图,平行四边形abcd中,bc=2ab,e为bc中点,求角AED的度数.请在今晚前答复.再问几道英语题:1.翻译词组:保守秘密2.surprise的形容词3.They're interested in watching football.(同义句) They () () in watching footb
如图,平行四边形abcd中,bc=2ab,e为bc中点,求角AED的度数.请在今晚前答复.
再问几道英语题:
1.翻译词组:保守秘密
2.surprise的形容词
3.They're interested in watching football.(同义句) They () () in watching football.
如图,平行四边形abcd中,bc=2ab,e为bc中点,求角AED的度数.请在今晚前答复.再问几道英语题:1.翻译词组:保守秘密2.surprise的形容词3.They're interested in watching football.(同义句) They () () in watching footb
90度
平行四边形abcd,bc=2ab,e为bc中点
所以AB=BE,CE=CD,所以角BAE=角BEA,角CDE=角CED
又角BEA+角CED+角AED=180
所以角BAE+角CDE+角AED=180 ①
因为AB平行CD,所以角BAD+角CDA=180
即角BAE+角EAD+角EDA+角EDC=180 ②
由① ②得角AED=角EAD+角EDA
又在三角形EAD中
角AED+角EAD+角EDA=180
所以角AED=90
1.keep secret
2.surprised
3.They (have) (interest) in watching football.
我也刚学到这里哈哈哈
英语题可以给你做了
1 保守秘密 keep secret
2 surprise 形容词 : surprising / surprised
3 同义句 They get interested in watching football.
keep secret(s),surprising(surprsed),feel interested.