Girls Just Want to Have Sums - S17-E19
Corrected entry: When Lisa crosses over to the boys side of the school, she looks in the window of the math class where the teacher asks the class the volume of a three circled snowman with a carrot nose. Lisa corrects Martin's answer by saying, "He forgot the volume of the carrot nose. One-third base times height!" This is incorrect, the volume of a cone (the shape of a carrot) is one-third pi radius squared times height. Or if she was going for the area instead, that is one-half the base time height. Lisa always prides herself on being incredibly smart, so she should not have made this mistake, especially when she was so confident.
Correction: Hence why she's still in school. because she *doesn't* know everything. Not a mistake, just a child's cocky confidence.