Install a triangular mirror with a base of 18 decimeters and a height of 1.6 decimeters. If it costs 0.8 yuan per square decimeter, how much does it cost to buy this piece of glass?
安装一块三角形的镜子，底是18分米，高是1.6分米，如果每平方分米0.8元，买这块玻璃要用多少钱？
<gadget id="calculator">10.6 / 2</gadget>
<output>5.3</output>

<gadget id="calculator">18 * 5.3 * 0.8</gadget>
<output>76.32</output>

<result>76.32</result>