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3. L. jajargenjang = a × t = 9 × 12 = 108 cm²

4. L jajargenjang = a × t = 7 × 19 = 133 cm²

5. L jajargenjang = a × t = (3+1) × 6 = 4 × 6 = 26 cm²

6 L jajargenjang = a × t

368 = 23 × t

t = 368/23

t = 16 cm