Geometric probability is the ratio of the favorable measure (area or length) to the total measure.
$$P(A)=\frac{s}{S}$$
where,
sβ measure of the favorable region (length, area, or volume), where a randomly chosen point/object must fall for the event to occur;
Sβ total measure (length, area, or volume) of the region over which the selection is made.
Geometric probability measures probability by comparing favorable measure to total measure.
The formula is P of A equals s divided by S, where s is the favorable measure and S is the total measure.