A cylindrical steel bar is 30 cm long and its diameter is long (1/15). It is known that the steel weighs 7.8 grams per cubic centimeter. How many grams does this steel bar weigh?
一根圆柱形钢筋，长30厘米直径是长的(1/15)，已知每立方厘米的钢重7.8克，这根钢筋重多少克？
<gadget id="calculator">1 / 15</gadget>
<output>1/15 = around 0.066667</output>

<gadget id="calculator">30 * (1/15)</gadget>
<output>2</output>

<gadget id="calculator">2 / 2</gadget>
<output>1</output>

<gadget id="calculator">1 ** 2</gadget>
<output>1</output>

<gadget id="calculator">3.14 * 1 * 30 * 7.8</gadget>
<output>734.76</output>

<result>734.76</result>