in traingle ABC ,DE || BC,AD=3.4,AB =8.5 Ac =10.5 find the DE
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Step-by-step explanation:
Since DE∥BC, from Basic Proportionality Theorem,
we have
AB/AD = AC/AE
∴
8.5/3.4
13.5
AE=8.5
3.4×13.5 =5.4
Hence, AE=5.4cm
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