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Mathematics, 30.09.2019 08:30 kiraswife

Seorang anak dengan tinggi 160 cm berdiri di depan menara dan melihat puncak menara dengan sudut elevasi 30 derajat, ia lalu berjalan sejauh 20 m mendekati menara dengan sudut elevasi 60 derajat .tinggi menara tersebut

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