piece of triangular glass has a measured base of 15 decimeters and a height of 12 decimeters. If the price per square meter of glass is 3.5 yuan, how much does it cost to buy this piece of glass?
一块三角形玻璃，测得它的底是15分米，高12分米，如果每平方米玻璃的价钱是3.5元，买这块玻璃要多少钱？
<gadget id="calculator">12 / 2 / 100</gadget>
<output>3/50 = around 0.06</output>

<gadget id="calculator">15 * (3/50) * 3.5</gadget>
<output>3.15</output>

<result>3.15</result>