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=2*22/7*7*7
=308 cm²
luas selimut kerucut
=nrs
=22/7*7*25
=550 cm²
jadi luas permukaan bangun adalah 550 + 308 = 858 sebelumnya cari terlebih dulu garis pelukis kerucut
s²=t²+r²
=24²+7²
=√(576+49)
=√625
=25