12. Perhatikan gambar! 42 cm km Keliling daerah yang diarsir ada.... (π = 2²²) A. 75 cm B. 108 cm C. 117 cm D. 150 cm
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K = ¼ × 2 × π × r
= ¼ × 2 × 22/7 × 42
= 11 × 6
= 66 cm
Jawaban:
bangun datar
panjang jari - jari (r) lingkaran adalah 42cm → diameter = 2r = 2(42cm) = 84cm
Daerah yg diarsir berbentuk 1/4 bagian lingkaran.
Maka:
K = 1/4 x πd + d = 1/4 x 22/7 x 84cm + 84cm = 1.848cm/28 + 84cm = 66cm + 84cm = 150cm
Opsi (D)