小红家刚购买了一套新房,准备用同一种正多边形地砖铺地板,爸爸了解到装饰市场有如下五种正多边形地砖,它们的内角度数分别为60度、90度、108度、120度、135度,你知道那些地砖可以用,那些不能用吗?

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• 小红家刚购买了一套新房,准备用同一种正多边形地砖铺地板,爸爸了解到装饰市场有如下五种正多边形地砖,它们的内角度数分别为60度、90度、108度、120度、135度,你知道那些地砖可以用,那些不能用吗?
• 小红家刚购买了一套新房,准备用同一种正多边形地砖铺地板,爸爸了解到装饰市场有如下五种正多边形地砖,它们的内角度数分别为60度、90度、108度、120度、135度,你知道那些地砖可以用,那些不能用吗?
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• Barack Obama was born to a white American mother,Ann Dunham,and a black Kenyan father,Barack Obama,Sr.,who were 31 young college students at the University of Hawaii.When his 32 left for Harvard,Barack and his mother stayed behind,and his father 33 returned alone to Kenya,where he worked as a government economist.Barack’s mother 34 an Indonesian oil manager and moved to Jakarta when Barack was six.He later 35 Indonesia as simultaneously lush and a har