Determine how much pressure I apply while standing on the floor. My body weight is 45 kg. Sole area 216 cm2.

The pressure of a person on the floor is the ratio of the force with which the mass of a person presses on the floor to the value of the area of the soles.
Hence:
P = F / S, where P is the person’s pressure on the floor (Pa); F is the force of pressure (F = Ft = m * g, where m is the mass of a person (m = 45 kg), g is the acceleration of gravity (we take g = 10 m / s ^ 2)), S is the area of the soles (S = 2 * S1,2 = 2 * 216 * 10 ^ -4 m ^ 2, where S1,2 is the area of one sole (S1,2 = 216 * 10 ^ -4 m ^ 2)).
P = F / S = m * g / 2S1,2 = 45 * 10 / (2 * 216 * 10 ^ -4) = 10417 Pa.
Answer. The pressure on the floor is 10,417 Pa.