r = 7 cm.
t = 25 cm.
Rumus luas permukaan tabung = 2 × π × r × (t + r) = 2 × 22/7 × 7 × (t + r) = 2 × 22 × (25 + 7) = 44 × 32 = 1.408 cm².
Luas permukaan bola = 2 × 22/7 × 7 × 7 = 2 × 154 cm = 308 cm².
Luas permukaan keseluruhan = 1.408 cm² (tabung) + 308 cm² (½bola) = 1.716 cm².
maaf kalo salah.
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r = 7 cm.
t = 25 cm.
Rumus luas permukaan tabung = 2 × π × r × (t + r) = 2 × 22/7 × 7 × (t + r) = 2 × 22 × (25 + 7) = 44 × 32 = 1.408 cm².
Luas permukaan bola = 2 × 22/7 × 7 × 7 = 2 × 154 cm = 308 cm².
Luas permukaan keseluruhan = 1.408 cm² (tabung) + 308 cm² (½bola) = 1.716 cm².
maaf kalo salah.