nostr:npub19thum6c9zu0nmdr59wsyp6asansus0uaz985s8h7exy6c3xm8v9s6p5tkg AB=40cm, simply apply Pythagorean theorem as AB=NZ=sqrt(NM^2-MZ^2) where MZ=9cm (MB=17cm, ZB=NA=8cm)

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