Jawaban:
C (240 cm)
Penjelasan dengan langkah-langkah:
K(½lingkaran besar) = ½ × 2πr = 22/7 × 42 = 132
K (½lingkaran kecil) = ½ × 2 × 22/7 × 21 = 66
K(arsiran) = 132 + 66 + 42 = 198 + 42 = 240 cm
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Jawaban:
C (240 cm)
Penjelasan dengan langkah-langkah:
K(½lingkaran besar) = ½ × 2πr = 22/7 × 42 = 132
K (½lingkaran kecil) = ½ × 2 × 22/7 × 21 = 66
K(arsiran) = 132 + 66 + 42 = 198 + 42 = 240 cm