7. A ABC - A DEF. If A (A ABC): A (ADEF )= 16:25, BC = 2.2 cm then find EF. * O 2.1 0 2.75 O 9.4 0 2.15
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Answer:
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Step-by-step explanation:
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For similar triangles,
ratio of area of triangles = ratio of square of corresponding sides
Hence,
Ar.△DEF
Ar.△ABC
=
DE
2
AB
2
25
16
=
EF
2
BC
2
EF
2
=
16
25
(2.2×2.2)
EF
2
=7.5625
EF=2.75cm
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