Xiaojie's grandfather welded a square frame with angle iron, then glued glass on the sides and bottom to make a fish tank without a cover. Grandpa shared a 6m-long angle iron. How many square meters of glass does this fish tank share?
小杰的爷爷用角铁焊接了一个正方形框架，随后在四周和底部粘上玻璃，制成一个无盖鱼缸．爷爷共用去6m长的角铁，这个鱼缸共用去玻璃多少平方米？
<gadget id="calculator">6 / 12</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">(1/2) * (1/2) * 5</gadget>
<output>5/4 = around 1.25</output>

<result>5/4 = around 1.25</result>