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luas 1 = 24x24 = 576cm²
⇒⇒⇒⇒⇒⇒⇒ x² = 9² + (24/2)² ⇒ x² = 81 +144 = x = √225 ⇒ x = 15
luas 2 = 4 x 15 x 24 x 1/2
= 720 cm²
luas total = 576 + 720
= 1296 cm² (b)