Arey bhau, the height must be perpendicular because area measures the 'covering' space, and a slant side would give less cloth to cover the ground, no? It is like when I measure cloth for my mother—if I measure along the slant, the piece will be too short. In our maths class, when we cut and rearranged a parallelogram into a rectangle, we saw clearly that only the perpendicular distance gives the true base and height. Just last week, I helped my father measure our small field for sowing, and using the slant length gave a wrong calculation for seeds.
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