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= 1/2 a . t
= 1/2 28 . 12
= 14 . 12
= 168 cm²
L 1/2 Lingkaran
= 1/2πr²
= 1/2 . 22/7 . 14 . 14
= 1/2 . 22 . 2 . 14
= 22 . 14
= 308 cm²
Luas bangun di atas
= L segitiga + L 1/2 Lingkaran
= 168 + 308
= 476 cm²