Xinmiao Primary School wants to afforest a triangular open space. The base of the triangular open space is 45 meters and the height is 38 meters. Among them, 500 square meters are planted with green grass, and the rest are planted with flowers. How many square meters is the area for planting flowers?
新苗小学要把一块三角形空地进行绿化，三角形空地的底是45米，高是38米，其中500平方米种绿草，其余地方种花卉，种花卉的面积是多少平方米？
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">45 * 38 * (1/2)</gadget>
<output>855</output>

<gadget id="calculator">855 - 500</gadget>
<output>355</output>

<result>355</result>