题目

Traditional fairytales are being abandoned by parents because they are too scary for their young children, a study found.     Research revealed one in five parents has ditched old classics such as Snow White and the Seven Dwarves and Rapunzel in favour of more modern books. One third of parents said their children have been left in tears after hearing the horrible details of Little Red Riding Hood. And nearly half of mothers and fathers refuse to read Rumplestiltskin to their kids as the themes of the story are kidnapping and execution. Similarly, Goldilocks and the Three Bears was 由10块相同的小长方形地砖拼成面积为1.6m2的长方形ABCD(如图)，则长方形ABCD的周长为____________.