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25. a × t bagi 2
15 cm × 12 cm bagi 2
90

s × s
15 × 15
225 cm
225 + 90 = 315 cm2

24. L = 1/2 x (12 +18 ) x 9
         =  1/2 x 30 x9 = 1/2 x 270 = 135 cm2 (b)