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L = 1/2. π r²
L = 1/2 (22/7)(14²) = 308
b) Luas arsiran = luas persegi - luas 1/2 ling
rusuk persegi = 26+14 = 40
r lingkaran = 14
L = 40x40 - 1/2 (22/7)(14²)
L =1.600 - 308 = 1.292