luas juring/luas lingkaran = PJ busur/Keliling
= 8/πr² = 1,6/2πr
= 16πr = 1,6πr²
= 16 = 1,6r
r = 10cm
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luas juring/luas lingkaran = PJ busur/Keliling
= 8/πr² = 1,6/2πr
= 16πr = 1,6πr²
= 16 = 1,6r
r = 10cm