Every weekend is important to the Franklin's family. During the week they don't have very much time together, but they spend a lot of time together on the weekend.

    Mr. Frankin works at the shoe store downtown during the week, but he doesn't work there on the weekend. Mrs. Franklin works at the city hospital during the week, but she doesn't work there on the weekend.

    Bobby and Sally Franklin go to the junior high school during the week, but they don't go there on the weekend.

    And the Franklin's dog Rover stays at home alone during the week, but he doesn't stay at home alone on the weekend.

材料1: “重叠的双刃斧是献祭的工具，它所杀伤动物的血可使其更具神力，它也可以作为神力引导下的一件神圣武器，或甚至可以代表以闪电避开天空的宙斯。”

——威尔·杜兰

材料2：饰有双斧的花瓶

△ABC的两边长分别为2和3，第三边的长是方程x²﹣8x+15=0的根，则△ABC的周长是 ____.