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AB^2 = AO^2 - BO^2
= 20^2 - 12^2
= 400 - 144
= 256
AB = akar dari 256
= 16 cm
luas layang-layang OBAC = 2 x luas segitiga ABO (ACO)
= 2 x (1/2 x a x t)
= 2 x (1/2 x 12 x 16)
= 2 x 96
= 192 cm^2
ket : luas segitiga ABO = luas segitiga ACO
_tanda '^' berarti pangkat