Option A is correct.
Step-by-step explanation:
Given: ABCD and JKLM are similar triangles.
Β Β Β Β Β Β AD = 3 m Β , CD = 4 m Β and ML = 6 m
To find: Perimeter of rectangle JKLM.
If two rectangles are similar then their corresponding sides are in equal ratio.
β
So,
JM = 9/2
JM = 4.5 m
Perimeter of rectangle JKLM = 2 Γ( JM + LM ) = 2 Γ ( 4.5 + 6 ) = 2 Γ 10.5 = 21 m
Therefore, Option A is correct.