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a) a=4
h=4√3/2=2√3
h=2√3
b)a=3√3
h=3√3×√3/2=3×3/2=9/2=4,5
h=4,5
c)a=√15
h=√15×√3/2=√45/2=3√5/2=3/2√5
h=1½√5