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10 ² = 8 x( 8 + x)
100 = 64 + 8x
100 - 64 = 8x
36 = 8x
36 : 8 = x
4,5 = x
y² = CN x CB
y = akar pangkat 2 dari 4,5 x 12,5
y = akar pangkat 2 dari 56,25
y = 7,5 cm