If P(2,3) and Q)2, 5) are points on a graph, calculate the length PQ

(sqrt{(x_2 – x_1)^2 + (y_2 – Y_1)^2})

= (sqrt{(2 – 2)^2 + (5 – 3)^2})

= (sqrt{0^2 + 2^2})

= (sqrt{4})

= 2 units

The character assumed by the author in his writing is