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400=144 (4² - r²)
400-144 = 16 -r²
256 = 16 - r²
r² = 256/16
r² = 16
r = 4 .
kalau salah maaf yaa ..
400=144 (4² - r²)
400-144 = 16 -r²
256 = 16 - r²
r² = 256/16
r² = 16
r = 4 .