Please help me i don't understand

The depth of the water x at the deepest point to the nearest hundredth of a metre is 0.5 meters
A chord of a circle is defined as the line segment joining any two points on the circumference of the circle.
The chord join any two points on the circumference of a circle.
The diameter is a chord that passes through the centre.
Therefore, the diameter is the longest chord of a circle.
The length 1m is a chord of the circular base of the cylinder.
Diameter of the circle = 1.5 meters.
radius = 1.5 / 2 = 0.75 meters
Therefore,
1.5 - 1 = 0.50 meters
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