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528 = 2 × 22/7 ×r × 24
528 = 1056 ÷ 7
= 150,8 ÷ 528
= 0,28
528=2x22/7xrx24
=44/7xrx24
=1056/7x r
=150,8xr
r= 528/150,8
=3,5 cm