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38.500 = 22/7. r² . 40
38.500 x 7/22 = 40r²
1750 x 77 = 40r²
134750/ 40 = r²
√3368,75 = r
58 = r cm
L = 2π r (r+t)
= 2. 3,14. 58 (58+40)
= 364,24 (98)
= 35695,52 cm²