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198 = 12² + (6 x 15 ) - 2 Larsir
198 = 144 + 90 - 2Larsir
198 = 234 - 2 Larsir
2Larsir = 234 - 198
2Larsir = 36
Larsir = 36/2
Larsir = 18 cm²
jawabannya D
144+90-6EC-6EC=198 cm²
36=12EC
EC=3 cm
luas yg diarsir=3×6=18 cm²(D)