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Q:

Given that ΔDEF ~ ΔABC. If the area of ΔABC is 9 cm2 and area of ΔDEF is 12cm2 , BC = 2.1 cm, then the length of EF is:

  • 1
    $${{8\sqrt { 2}}\over 5}cm $$
  • 2
    $${{3\sqrt { 7}}\over 5}cm $$
  • 3
    $${{4\sqrt { 7}}\over 5}cm $$
  • 4
    $${{7\sqrt { 3}}\over 5}cm $$
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Answer : 4. "$${{7\sqrt { 3}}\over 5}cm $$"

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