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Dengan demikian, berlaku phytagoras:
AE = √AB² - BE²
AE = √10² - 8² = √100-64 = √36
AE = 6 cm
Dengan segitiga CDE, berlaku phytagoras:
CE = √CD²-DE²
CE = √17²-8² = √289-64 = √225
CE = 15 cm
Sehingga,
d₁ = AE + CE = 6+15 = 21 cm
d₂ = BE + DE = 8+8 = 16 cm
Sehingga,
Luas:
L = 1/2 x 21 x 16
L = 21 x 8
L = 168 cm²