If the ratio of the areas of two similar triangle ABC and DEF is 36:81 and EF = 6.9 cm., then BC is equal to

If the ratio of the areas of two similar triangle ABC and DEF is 36:81

1.	If the ratio of the areas of two similar triangle ABC and DEF is 36:81 and EF = 6.9 cm., then BC is equal to
A.	4.6 cm.
B.	6.4 cm.
C.	4 cm.
D.	6 cm.
Answer» B. 6.4 cm.

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If the ratio of the areas of two similar triangle ABC and DEF is 36:81 and EF = 6.9 cm., then BC is equal to

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