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BOC = sudut siku-siku = 90⁰
x = 54 . 4 = 216 cm²
Lalu hitung besar sudut AOD :
360⁰ = AOB + AOD + DOC + BOC
360⁰ = 110⁰ + AOD + 30⁰ + 90⁰
360⁰ = 230⁰ + AOD
AOD = 360⁰ - 230⁰ = 130⁰
Baru dihitung luas juring AOD :
= 78 cm²
gunakan perbandingan
<BOC/<AOD = lj BOC/lj AOD
90/130 = 54/lj AOD
lj AOD = 130 x 54/90
lj AOD = 78 cm²