问题
填空题
已知等腰三角形的腰长为6，面积为9
|
答案
如图，已知AB=BC=6，
∵S△ABC=
AB?CD=1 2
×6CD=91 2
，3
解得：CD=3
，3
∴sin∠A=
=CD AC
=3 3 6
，3 2
∴∠A=60°，
故答案为60°或120°．
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已知等腰三角形的腰长为6，面积为9
|
如图，已知AB=BC=6，
∵S△ABC=
AB?CD=1 2
×6CD=91 2
，3
解得：CD=3
，3
∴sin∠A=
=CD AC
=3 3 6
，3 2
∴∠A=60°，
故答案为60°或120°．
| 完形填空。 | ||||
| I have a good friend. 1 name is Mary. She comes 2 America. She is in China 3 her father and mother. She can speak 4 Chinese. She is in the No. 15 Middle School in Shanghai. Her father and mother 5 . They are in the No. 15 Middle School, 6 . Mary is a good student. She 7 school five days a week. She likes 8 up early. She 9 to be late (迟到). She often goes to school very early. But today she got up late. So she got to the classroom at seven thirty. But there weren't any students in the classroom. She wasn't late. She was still early. It was Saturday today. The students were all 10 . (生词：got是get的过去式；was是is的过去式；were是are的过去式) | ||||
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