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(d1•d2)/2=48
(8•x+1)/2=48
8•x+1=48•2=96
x+1=96:8=12
d₂ = ( x + 1 ) cm
Luas Layang - Layang = 48 cm²
Luas Layang - Layang = 1/2 x d₁ x d₂
48 = 1/2 x 8 x ( x + 1)
48 = 4 ( x + 1 )
48 = 4x + 4
48 - 4 = 4x
44 = 4x
x = 44 / 4 = 11
Jadi, Panjang d₂ ATAU Panjang BD = ( x + 1 )
= 11 + 1 = 12 (B.)