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pp= a²√3:2=6²√3:2= 18√3
H=
h= 6√3:2=3√3
3√3*⅔= 2√3
2√3²+10²=c²
12+100=c²
c²=112
c=√112
c=4√7
⅓*18√3*4√7= 24√21