Height of a person is 1m 65cm.

As we know that 1 m = 100 cm……..eq(1)

1 cm = 10 mm…….eq(2)

So, height of the person is = 1m 65 cm

= 1m + 65cm

= 100cm + 65cm(from eq(1))

= 165cm

= 165 10 mm ( from eq(2))

= 1650 mm

Therefore, Height of the person in millimetre is 1650mm.