Question

Assertion (A)
The curved surface area of a cone of base radius 3 cm and height 4 cm is 15π cm².\

Reason (R)
Volume of a cone = πr²h

1. Both Assertion (A) and Reason (R) are true and Reason (R) is a correct explanation of Assertion (A).
2. Both Assertion (A) and Reason (R) are true but Reason (R) is not a correct explanation of Assertion (A).
3. Assertion (A) is true and Reason (R) is false.
4. Assertion (A) is false and Reason (R) is true.

Answer 1

Assertion (A) is true and Reason (R) is false.
Assertion (A):
Curved surface area of a cone `=pisqrt("r"^2 + "h"^2 )`

`= pixx3xxsqrt((3)^2 + (4)^2)`

`=pixx3xxsqrt(9+16)`

`=pixx3xxsqrt(25)`

= 15 π cm² 

Hene, Assertion (A) is true.

Reason (R): The given statement is false.