human
Recognise perpendicular lines ![An image of 8 line segments on a square grid. AB is a vertical line measuring 4 units. CD is a vertical line measuring 2 units. EF is a diagonal line with a positive gradient of 4. GH is a diagonal line with a negative gradient of -4. IJ is a horizontal line measuring 3 units. KL is a diagonal line with a negative gradient of -1. MN is a diagonal line with a positive gradient of 1. OP is a diagonal line with a positive gradient of 4.]() Which line segment is perpendicular to \( \mathrm{MN} \) ? OP
gpt
Does not know the meaning of perpendicular