There is a piece of triangular glass with a base of 8 meters and a height of 3.5 meters. If the price of glass per square meter is 14 yuan, how much does it cost to buy this piece of glass?
有一块三角形的玻璃，底是8米，高是3.5米，如果每平方米的玻璃价钱是14元，买这块玻璃需要多少钱？
<gadget id="calculator">3.5 / 2</gadget>
<output>1.75</output>

<gadget id="calculator">8 * 1.75 * 1.4</gadget>
<output>19.6</output>

<result>19.6</result>