How tall is 1.86 in feet?

Answer 1

Assuming 1.83 means 1.83 metres

Then = 1,830 mm

convert = 72.102 inches

then = 6 feet near enough

with just over a tenth of one inch added

In reverse

1 foot = 304.8 mm

6 x 304.8 = 1,828.8 mm

so near enough 1,830 mm = 1.83 m

Q.E.D.

Answer 2

1.74 km = 5708 ft 7.94 inches. And if you did not mean kilometres you should have said so.

Answer 3

6.1 feet = 6 remainder 1.2 inches 6'1.2"

Answer 4

1.82m is 5 feet 11.7 inches.