Question

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Answer 1

Answer:

(1)

$we \: think \\ {ab}^{2} = {ae}^{2} + {be }^{2} \\ poved \: that.. \\ < pqr = 90 \\ art....right \: angel \: \: \: lmn \\ 1. {ln}^{2} = {lm}^{2} + {mn}^{2} \\ = {ae}^{2} + {be}^{2} \\ = {ab}^{2} \\ so.ln = ab \\ 2.pqr \: and \: lmn \\ ae = lm \\ qr = mn \\ and..pr = ln \\ so...aeb = lmn \\ < e = < m \\ so... < e = 90 \\ < aeb = 90 \\ {proved}$