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Answer:
6. 12 sq mm
14. 6860 cm³
Step-by-step explanation:
6. Area of trangle
height = 4 mm
base = 6 mm
14. Side of cube = 7 cm
volume of cube = (side)³
= (7)³ = 343 cm³
Volume of 20 cubes = 20 × 343 = 6860 cm3