如图,在平行四边形ABCD中,AB=4,BC=6,分别以A,C为圆心,以大于的长为半径作弧,两弧相交于M,N两点,作直线MN交AD于点E,则△CDE的周长是( ) A.7 B.10 C.11 D.12 答案:B解:利用作图得MN垂直平分AC, ∴EA=EC, ∴△CDE的周长=CE+CD+ED =AE+ED+CD =AD+CD, ∵四边形ABCD为平行四边形, ∴AD=BC=6,CD=AB=4, ∴△CDE的周长=6+4=10.
从A-E中选出与1-5问题相对应的答语。
( ) 1. How do you do? ( ) 2. What's wrong? ( ) 3. Happy birthday! ( ) 4. Let's go shopping. ( ) 5. Marry Christmas.
A. The same to you. B. It's broken. C. All right. D. How do you do? E. Thank you!