讲解一下这道题目---**Header:** 教学反馈 (Teaching Feedback) **Question 5:** **Question Stem:** 根据下面同学们的描述，算一算这个三角形的周长是( /8 )cm。 (Translation: Based on the descriptions of the students below, calculate the perimeter of this triangle, which is ( /8 ) cm.) **Other Relevant Text (Student Descriptions):** * **Student 1 (Cartoon Boy, top left):** 按角分，它是一个钝角三角形。(Classified by angles, it is an obtuse triangle.) * **Student 2 (Cartoon Girl, top right):** 它的最长边是8cm。(Its longest side is 8 cm.) * **Student 3 (Cartoon Boy, bottom left):** 按边分，它是一个等腰三角形。(Classified by sides, it is an isosceles triangle.) * **Student 4 (Cartoon Girl, bottom right):** 其中一条边是5cm。(One of its sides is 5 cm.) **Chart/Diagram Description:** * **Type:** Diagram with cartoon characters and speech bubbles. * **Main Elements:** * Four cartoon student characters are depicted. * There is a smiling boy character on the top left. A speech bubble next to him contains the text: "按角分，它是一个钝角三角形。" * There is a winking girl character on the top right. A speech bubble next to her contains the text: "它的最长边是8cm。" * There is another boy character (looking surprised/curious) on the bottom left. A speech bubble next to him contains the text: "按边分，它是一个等腰三角形。" * There is another girl character (with a ponytail) on the bottom right. A speech bubble next to her contains the text: "其中一条边是5cm。" * The speech bubbles are rectangular with a triangular pointer indicating the character speaking. * The four descriptions provide information about a triangle's properties (type by angle, type by side, side lengths).