1. The problem asks us to find the total amount of calico material needed to make a tent shaped like a triangular prism, including its ground sheet, with the total surface area given as 60 cm². 2. A triangular prism consists of two triangular bases and three rectangular faces. The total surface area (calico needed) is the sum of the area of these faces. 3. Let's denote the total surface area as $A$. Here, $A = 60$ cm² is already given. 4. Therefore, the total calico needed is the total surface area $A = 60$ cm² as stated. Final answer: The total calico needed to make the tent, including the ground sheet, is **60 cm²**.