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= luas selimut kerucut + luas alas kerucut
= π.r. s + π.r^2
= π.16.20 + π.16.16
= π.320 + 256π
= 576π cm^2
keterangan
r = 1/2.d
r = 1/2.32
r = 16
s = √(r.^2 +t^2)
s = √(16^2 + 12^2)
s = 20