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a)
r=2/3h
h=a√3/2
h=12√3/2=6√3
r=2/3*6√3=4√3
P=πr²
l=2πr
P=(4√3)²π=48πcm²
l=2*4√3π=8√3πcm
b)
r=1/3h
r=1/3*6√3=2√3
P=(2√3)²π=12πcm²
l=2*2√3π=4√3πcm