Li Ming surrounded a triangle with a 1m long iron wire, measured one side of the triangle to be (2/5)m, and the other side was (3/10)m, how long is the third side in meters? What kind of triangle is it?
李明用一根1m长的铁丝围成了一个三角形，量得三角形的一边是(2/5)m，另一边是(3/10)m，第三条边长多少米？它是一个什么三角形？
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">3 / 10</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">1 - (2/5) - (3/10)</gadget>
<output>3/10 = around 0.3</output>

<result>3/10 = around 0.3</result>