Right Circular Cylinder

Q.

Assertion: Curved surface area of a right circular cone is $\pi \times$ radius of base $\times$ slant height.
Reason: Curved surface area of a right circular cylinder is $2\times \pi \times$ radius of base $\times$ height.
Which of the following is correct?

1. Both A and R are true and R is the correct explanation of A.
2. Both A and R are true and R is not the correct explanation of A.
3. A is true and R is false.
4. A is false and R is true.

Q.

What are 3-Dimensional Shapes