问题
填空题
n边形的每个外角都等于30°,则n=______,它的内角和是______.
答案
边数n=
=12;360 30
内角和是:(12-2)•180=1800°.
n边形的每个外角都等于30°,则n=______,它的内角和是______.
边数n=
=12;360 30
内角和是:(12-2)•180=1800°.
阅读理解。 | |||
| |||
1. We can infer (推断) that the child in poem 2 is _____. | |||
A. brave B. honest C. scared D. cold | |||
2. The third poem is written for _____. | |||
A. kids B. adults C. teens D. animals | |||
3. The fourth poem is a kind of _____. | |||
A. Limerick B. Nature poem C. five-line poem D. Haiku | |||
4. Poem 2 is mainly about _____. | |||
A. home B. night C. sleeping D. bed |