Think of the analogy of water flowing in a pipe. The resistance of a pipe to water flow will be less the larger the cross sectional area of the pipe. Similarly, the resistance of a conductor to the flow of electrons will be less the larger the cross sectional area of the conductor.

However, it is the “resistance” of the conductor not its “resistivity” that varies inversely with the cross sectional area of the conductor. The “resistivity” of a conductor is a material property of the conductor.

The resistance of a conductor is given by

$$R=\frac {ρL}{A}$$

Where

$R$ = conductor resistance in Ohms

$ρ$ = the resistivity of the conductor material in Ohm-meter

$L$ = the length of the conductor in meters

$A$ = the cross sectional area of the conductor in square meters.

Hope this helps

Think of the analogy of water flowing in a pipe. Water flows through a pipe more easily the greater the cross sectional area. Similarly, current will flow through a conductor more easily the greater the cross sectional area of the conductor.

However, it is the “resistance” of the conductor not its “resistivity” that varies inversely with the cross sectional area of the conductor. The “resistivity” of a conductor is a material property of the conductor.

The resistance of a conductor is given by

$$R=\frac {ρL}{A}$$

Where

$R$ = conductor resistance in Ohms

$ρ$ = the resistivity of the conductor material in Ohm-meter

$L$ = the length of the conductor in meters

$A$ = the cross sectional area of the conductor in square meters.

Hope this helps