Lines are drawn from the three small pyramids of P1 to those of P3. The center of the three intersect aligns with that of the small southern pyramid (P10).
L1 joins both center pyramids of the subsidiary tri-groups.
C2 is drawn from center of P2 and tangent to L1.
Radius measure of C2 = C1 = 311 Rc.
Distance from center of P2 to P10 = theoretical height of P1 = 280 Rc.
Angle formed from P1-P2-P3 equal to P1-P10-P3 = 191.4 degrees.