Xiān / cè / liáng / liǎng / tiáo / xiàn / zhī / jiān / de / jiāo / jiǎo / zài / jì / suàn / tú / xíng / de / miàn / jī

先测量两条线之间的交角，再计算图形的面积。

First measure the angle of intersection between the two lines, then calculate the area of the figure.