Perhatikan gambar! 50 cm 20 cm Luas permukaan bangun tersebut adalah... cm². A 3,678 B 3,768 C 15,700 D 15,800
Luas Permukaan :
• = 2 × π × r × ( r + t )
• = 2 × 3,14 × ( 20 cm ÷ 2 ) × (( 20 ÷ 2 ) + 50 cm )
• = 2 × 3,14 × 10 cm × ( 10 cm + 50 cm )
• = 2 × 3,14 × 10 cm × 60 cm
• = 2 × 3,14 × 600 cm
• = 2 × 1.884 cm
• = 3.768 cm²
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Penjelasan dengan langkah-langkah:
Lp = 2πr(r+t)
Lp = 2 × 3,14 × 10 (10 + 50)
Lp = 2 × 31,4 × 60
Lp = 2 × 314 × 6
Lp = 628 × 6
Lp = 3.768 cm² (b)
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