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Ljuring = 90/360 r²
Ljuring = 1/4 . 22/7 . 14²
Ljuring = 1/4 . 616
Ljuring = 154 cm²
Lsegitiga = a . t/2
Lsegitiga = 14 . 14 /2
Lsegitiga = 98 cm² *agak ragu, itu masuknya segitiga sama kaki apa siku2, tapi kalo aku siku2
Ltembereng = Ljuring - Lsegitiga
Ltembereng = 154 - 98
Ltembereng = 56 cm²
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Ljuring = α/360 . Llingkaran
Ljuring = α/360 . r²
62,8 = α/360 . 3,14 . 10²
62,8 = α/360 . 314
62,8 / 314 = α/360
1 / 5 = α/360
α = 360 /5
= 72
jadi sudut ABC
360 - 72
288 derajat