If both an equilateral triangle and a square have side lengths of 5 cm, what is the perimeter of the triangle equal to the perimeter of the square?
一个等边三角形和一个正方形的边长都是5cm，这个三角形的周长是正方形周长的多少．
<gadget id="calculator">5 * 3</gadget>
<output>15</output>

<gadget id="calculator">5 * 4</gadget>
<output>20</output>

<gadget id="calculator">15 / 20</gadget>
<output>3/4 = around 0.75</output>

<result>3/4 = around 0.75</result>