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Verified answer
42 : 2 = 21L : 1/2 × 22/7 × 21 × 21 = 693
Verified answer
Diketahuid = 42 cm
r = 21 cm
L = phi x r²
= 22 per 7 x 21²
= 1386 cm²
Setengah lingkaran = 1386 : 2 = 693 cm²
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