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D1 = 8 cm
D2 = x+1
L = 48 cm²
maka :
L = (D1 X D2 ) /2
48 = (8 x (x+1) / 2
48 x 2 = 8x + 8
96 = 8x + 8
8x = 96-8
x = 88/8
x = 11
jadi nilai x = 11 cm (c)
48=(8x(x+1 ))
48x2=8x+8
8x=96-8
x = 88/8
x =11
c.11