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1886,5 = 22/7 x r²
r² = 1886,5 x 7/22
r² = 600,25
r = √600,25
r = 24,5
diameter adalah r + r atau r x 2
jadi diameternya dalah 24,5 x 2 = 49cm
= √ ( 1886,5 x 7 : 22 ) x 2
= √ (13205,5 : 22 ) x2
= √ ( 600,25 ) x 2
= 24,5 x 2
= 49 cm