题目

With the Tesla Roadster and other plug­in (插入式) electric vehicles hitting the road，demand is growing for accessible refueling points to recharge them. Carbon Day Automotive, a Chicago­based company，has now demonstrated a solar­powered recharging point, known as the Solar Plug­In Station，which lets motorists easily charge their cars using electricity that has been produced without any environmental damage. The Solar Plug­In Station has gone on show in Chicago as part of the city’s bid to host the 2016 Olympic Games. According to Carbon Day Automotive，the Solar Plug­I计算下面图形中阴影部分的面积。