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d1.d2 / 2 = 48
8(x+1) / 2 = 48
4(x+1) = 48
4x+4 = 48
4x = 48-4
4x = 44
x = 44 / 4
x = 11
BD = (x+1) cm = (11+1) cm = c. 12 cm
Dig AC = 8 cm
dig BD = x+1
L= 48 cm
maka :
L = (dig AC x dig BD ) / 2
48 = 8 x (x+1) / 2
48 x 2 = 8x + 8
96 = 8x + 8
8x = 96 - 8
x = 88/8
x = 11
maka panjang BD = x + 1 = 11 + 1 = 12 cm (C)