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Verified answer
Jawab :L.segitiga = a . t/2 = 21 . 21/2
= 441/2 = 220.5
L.lingkaran = πr² = 22/7 . 21 . 21 = 1386 cm²
L.juring OAB = 90°/360° . 1386
= 1/4 . 1386
= 346.5 cm
L.Tembereng = L.juring - L.segitiga
= 346,5 - 220,5
= 126 cm²