If you know the coordinates either measure it or use the distance formula
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Distance. Now get back to apex...
Let the two points be (a,b) and (c,d). Then the distance between D= sqrt [ (a-c)^2 + (b-d)^2] where ^2 means squared.
The Law of Cosines: c^2=a^2 + b^2 -2abcos(ab) , c is the distance between the two points a and b and (ab) is the angle between a and b from the origin. If one point is taken as the origin, and a and b a re taken at right angles to each other, then cos(ab) is zero and you have Pythagora' Theorem..
There are numerous symbols. d(A,B), |AB|, AB are some symbols for the distance between points A and B. The Greek letter Delta can also be used in place of d in the first example.
It is |B - C|