Question

Assertion (A)	Reason (R)
The curved surface volume of a cone of base radius 3 cm and height 4 cm is (15π) cm2.	Volume of a cone = πr2h.

Options

• Both Assertion (A) and Reason (R) are true and Reason (R) is a correct explanation of Assertion (A).

• Both Assertion (A) and Reason (R) are true but Reason (R) is not a correct explanation of Assertion (A).

• Assertion (A) is true and Reason (R) is false.

• Assertion (A) is false and Reason (R) is true.

Answer 1

Assertion (A) is true and Reason (R) is false.

Explanation:

Assertion (A):

Curved surface area of a cone `=pisqrt("r"^2 + "h"^2 )`

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

`=pixx3xxsqrt(9+16)`

`=pixx3xxsqrt(25)`

= 15π cm² 

Hence, Assertion (A) is true.

Reason (R): The given statement is false.