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**1. Homework Statement**

Decay of particle A into three particles of equal mass, prove that the Dalitz plot is a equilateral triangle with height Q/2, inscribed within a triangle with height Q.

**2. Homework Equations**

Q = MassA - 3(MassB)

**3. The Attempt at a Solution**

For relativistic kinematics, T (kinetic energy) is = E = p (in natural units)

I'm not sure where to go from here. Thanks,