垂直 | chuí zhí | perpendicular / vertical | |
横向 | héng xiàng | horizontal / orthogonal / perpendicular / lateral / crosswise | |
垂线 | chuí xiàn | (math.) perpendicular line / vertical line | |
力臂 | lì bì | lever arm (i.e. perpendicular distance from the fulcrum to the line of force) |