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48 = ½ x 8 x (x+1)
48 = 4 x (x+1)
48:4 = x+1
12 = x + 1
12-1 = x
11 = x
bd = x + 1= 11 + 1 = 12
48 = 8 × (x + 1) × 1/2
48 = 4(x+1)
48 = 4x + 4
48-4 = 4x
44 = 4x
44 : 4 = x
11 = x
BD = x + 1 = 11 + 1 = 12 cm