In 3-D pie and doughnut charts that were created with older versions of the software, the starting angle is 0 degrees instead of 90 degrees. For old and new 2-D charts the default starting angle is 90 degrees.
三维饼图和圆环图是由较老的软件版本创建的，起始角度是 0 度而不是 90 度。对于旧的和新的二维图表，默认的起始角度是 90 度。