Question

Perhatikan gambar berikut! Luas permukaan bangun tersebut adalah.... cm²

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Answer 1

Jawaban:

Penyelesaian :

• r = 21 cm
• t = 38 cm

Luas permukaan tabung

[tex] \sf Lp = 2 \times \pi \times r(r + t)[/tex]

[tex]\sf Lp = 2 \times \frac{22}{7} \times 21(21 + 38)[/tex]

[tex]\sf Lp = 2 \times \frac{22}{ \cancel{7}} \times { \cancel{21}}^{ \: \: 3} (59)[/tex]

[tex]\sf Lp = 2 \times 22 \times 3(59)[/tex]

[tex]\sf Lp = 2 \times 66(59)[/tex]

[tex]\sf Lp = 132(59)[/tex]

[tex]\sf Lp = 7.788 \: {cm}^{2} [/tex]