甲乙两个图形中阴影部分在图中所占的百分比有大有小，（其中图乙小圆直径与图甲小圆直径相等，还等于大半圆的半径），阴影部分在图中所占的百分比比较大的是____ 图形，是____ %．

    During the summer holiday，Alice had a nice trip．First she took a plane from Changchun to Beijing．She went to the Great Wall．She was very tired．But she was  happy．She likes Beijing very much．Then she went to London by plane．She visited Big Ben，the clock tower．There were many museums in London．She learnt a lot there．People in London love eating fish and chips．She stayed in London for 5 days．Then she took a plane to Shanghai．Then she went to Changchun by plane．

根据短文，判断正误。

（Ⅰ）求异面直线D₁E与A₁D所成的角；

（Ⅱ）若二面角D₁﹣EC﹣D的大小为45°，求点B到平面D₁EC的距离．