If ∆ABC ∼ ∆DEF area of ∆DEF=100cm², AB/DE =1/2, the area of ∆ABC is.
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Step-by-step explanation:
AB
2
/DE
2
=area(△ABC)/area(△DEF)
AB
2
/7
2
=100/196
AB
2
=100∗49/196
AB
2
=25
AB=5
AB = 5 cm
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