d=42cm
r=21cm
t tabung tanpa alas tutup=21cm
t kerucut tanpa alas=30cm
s anggap 30cm
Maka luas permukaan
2×Ls kerucut+Ls tabung
=2×πrs+2πrt
=2×22/7×21×30 + 2×22/7×21×21
=2×22×3×30 + 2×22×3×21
=44×90 + 2×1.386
=3.960 + 2.772
=6.732cm²
Semoga bermanfaat
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Verified answer
Penyelesaian
d=42cm
r=21cm
t tabung tanpa alas tutup=21cm
t kerucut tanpa alas=30cm
s anggap 30cm
Maka luas permukaan
2×Ls kerucut+Ls tabung
=2×πrs+2πrt
=2×22/7×21×30 + 2×22/7×21×21
=2×22×3×30 + 2×22×3×21
=44×90 + 2×1.386
=3.960 + 2.772
=6.732cm²
Semoga bermanfaat