我是一个小学生，用大白话给我讲解下这道题目---**Question Stem:** 5. 下图是红星小学的操场，丁老师每天绕着操场跑5圈，一共跑了多少米? **Chart/Diagram Description:** * **Type:** Geometric figure representing a sports track or playground. * **Shape:** The figure is a stadium shape, consisting of a rectangle with a semicircle attached to each end. The track appears to be the perimeter of this shape. The interior of the shape is colored blue. * **Dimensions:** * The length of the rectangular part is labeled as 80米 (80 meters). This is indicated by a double-headed arrow above the rectangular section. * The width of the rectangular part (which is also the diameter of the semicircles) is labeled as 60米 (60 meters). This is indicated by a double-headed arrow vertically oriented next to the width of the rectangular section/diameter of the semicircle. * **Lines:** The outer boundary of the track is a solid line. The separation between the rectangular part and the semicircular parts is indicated by dashed lines on both sides. * **Labels and Annotations:** * "80米" (80 meters) is labeled horizontally above the rectangular section, indicating its length. * "60米" (60 meters) is labeled vertically next to the width/diameter, indicating its dimension. * **Interpretation:** The diagram shows a track shaped like a rectangle with semicircles at each end. The length of the rectangular part is 80 meters, and the diameter of the semicircles is 60 meters. This means the radius of each semicircle is 60 / 2 = 30 meters. The total perimeter of one lap around the track consists of the lengths of the two straight sides (80 meters each) and the circumference of the two semicircles (which together form a full circle with a diameter of 60 meters). **Options:** None are provided in the image.