<u>EXplanation</u> To get the volume of the given figure, we should calculate the volume of the inner part and subtract it from the volume of the outer part.
Volume of the inner part = πr²h = π × 1.5² × 9 = 63.62 mm³ Volume of the outer part = π × 3.5² ×9 =346.36 mm³
volume of the figure = 346.36 - 63.36 = 282.74 mm³ The correct answer is c) 282.7mm³