91. In ∆ABC, D and E are the points on sides AC and AB, respectively, such that ∠ADE= || edu214

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91. In ∆ABC, D and E are the points on sides AC and AB, respectively, such that ∠ADE=∠B . If AD=7.6cm, AE=7.2cm,BE=4.2cm and BC = 8.4cm, then DE is equal to:
∆ABC में, AC और AB भुजाओं पर D और E बिन्दु क्रमशः इस तरह है कि ∠ADE = ∠B है |अगर
AD = 7.6cm, AE= 7.2 cm, BE=4.2cm और BC = 8.4cm है , तो DE बराबर है :
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