Well the answer is:
No he was not tricked.
This is what happened:
He is 1 meter tall and the water is 75 cm deep.
Let's convert the units so that they are the same we can look at it two ways.
1 meter (m) = 100 centimeters (cm)
This means that just about 75% of his body would be submerged.
You can also convert it 75 centimeters into meters.
75 centimeters = 0.75 meters.
Just remember that centi means 100th of a unit or
.