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Diketahui :- Diameter = 14 cm
- Jari - Jari = ½ × 14 cm = 7 cm
- Tinggi Tabung = 44 cm - 24 cm = 20 cm
- Tinggi Kerucut = 24 cm
Ditanya : Luas Permukaan Bangun = ....?
Penyelesaian :
- Garis Pelukis :
s = √r² + t²
s = √7² + 24²
s = √49 + 576
s = √625
s = 25 cm
- Luas Permukaan Bangun :
L = Luas Selimut Kerucut + Luas Permukaan Tabung Tanpa Tutup
L = π × r × s + π × r × (r + 2t)
L = (22/7 × 7 × 25) + (22/7 × 7 × (7 + 2(20)))
L = (22 × 25) + (22 × (7 + 40))
L = 550 + (22 × 47)
L = 550 + 1.034
L = 1.584 cm²
Jawaban : C. 1.584 cm²
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