A square orchard has a side length of 15 meters, one side is against a wall, and the other three sides are surrounded by fences. What is the length of the fence in meters?
一块正方形果园，边长是15米，一面靠墙，另外三面用篱笆围起来，篱笆长是多少米．
<gadget id="calculator">15 * 3</gadget>
<output>45</output>

<result>45</result>