circle based rectangle
A rectangle and two circles.
A 3D shape that can be created using one rectangle and two circles is a cylinder with a rectangular base. The rectangle forms the side of the cylinder, while the two circles can serve as the top and bottom faces. When the rectangle is wrapped around, it connects the edges of the circles, forming a closed cylindrical shape.
A child's drawing of a car.
A cylinder would fit the given description
...a cylinder...
circle based rectangle
A rectangle and two circles.
the solid you are after is a cylinder
Cylinder
A child's drawing of a car.
cylinder
A cylinder would fit the given description
2 circles and 1 rectangle
Answer to part 1 = Oblong (ellipsoidal rectangle) Answer to part 2 - possibly egg-shaped? Probably still oblong though.
1 rectangle and 2 circles.
cylinder