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Verified answer
Ijinkan saya coba bantu jawabr = 21 cm
d = 2 x 21 = 42 cm
Luas lingkaran
--> πr²
= 22/7 x 21 x 21
= 22 x 3 x 21
= 66 x 21
= 1386 cm²
atau bisa juga
Luas lingkaran
--> 1/4πd²
= 1/4 x 22/7 x 42 x 42
= 1/4 x 22 x 6 x 42
= 1/4 x 5544
= 1386 cm²