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OD² = AD² -A0²
OD² = 20² - 12² = 400 - 144= 256
OD =√256 = 16
OB² = AB² - AO² = 13² - 12²
= 169 - 144
OB = √25 = 5cm
D2 = OD + OB = 16 + 5 = 21cm
1/2x D1 x D2 = Luas
= 1/2 x 24 x 21
= 252cm²
= 400 - 144
= 256
AO = √256
= 16cm
BO² = 13² - 12²
= 169 - 144
= 25
BO = √25
= 5cm
BD = AO + BO
= 16 + 5
= 11cm
L = d1 x d2/2
= 24 x 11/2
= 132cm²
Jadi, luas layang-layang tsb adalah 132cm²