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r ² = 1/2 (8)² x 1/2 (6)2
r² = 4² x 3²
r² =16 + 9
r² = 25
r =√25
r = 5
Keliling 4 x r
= 4 x5
= 20 ,Thx
Semoga Membantu,jangan lupa dinilai ya !