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luas tembereng = Ljuring - Lsegitiga
Ltembereng = 1/4πr^2 - a.t/2
Ltembereng= (1/4.22/7. 14^2) - (14^2 /2) = 11/2 .98 -98 = 98(11/2 - 1) = 98(9/2) =441 cm^2
L = 8.441 cm^2= 3528 cm^2 3.