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= 1/4 . 3,14 . 20²
= 1/4 . 3,14 . 400
= 100 . 3,14
= 314 cm²
luas segitiga = 1/2 a t
= 1/2 . 20 . 20
= 10 . 20
= 200 cm²
luas daerah yang diarsir = 314 - 200
= 114 cm²