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a. L = 8 cm × 12 cm ÷ 2
L = 48 cm²
b. L = 15 dm × 18 dm ÷ 2
L = 135 dm²
c. L = 21 mm × 30 mm÷ 2
L = 315 mm²
d. L =15 dm × 2 dm ÷ 2
L = 15 dm²
e. L =15 cm × 30 cm ÷ 2
L = 225 cm²