Question

the section of a certain solid is bounded by two concentric circles whose radii are 6.1 and 4.1 find the area of this section

Answer 1

The question asks for area not volume, so we assume the circles are concentric in the same plane. The area is therefore the area between the circles: π(6.1^2-4.1^2)=(6.1-4.1)(6.1+4.1)π=2*10.2π=20.4π=64.09 sq units.