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88= 22/7 × d
d= 88 : 22/7
d= 88 × 7/22
d= 4 × 7
d= 28 cm ----> r= 14 cm
L. lingkaran :
π × r²
22/7 × 14 × 14
22 × 2 × 14
44 × 14
616
Jadim luas lingkaran tersebut adalah 616 cm².
luas = 22/7 x 14 x 14 = 616