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a. 314 = 4 . 22/7 . r² => 314 x 7 = 88 . r² => 2198 = 88 . r² => r² = 2198/88 = 24,9 / 25 dibulatkan => r = √25 = 5
b. 9856 = 4x22/7xr²
19992 = 88 r²
r² = 227.1 / 227 dibulatkan
r =√227
r =15