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Question

Ler ΔABCΔDEF and their areas be respectively, 64cm2 and 121cm2. If EF =15.4 find BC

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Solution

ΔABCΔDEF

areaofΔABCareaofΔDEF=64121

BC2EF2=64121=(811)2

BCEF=811

BC15.4=811

BC=8×15.411

=8×1.4

=11.2

BC=11.2cm.

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