Assertion (A) : If semi vertical angle of a cone is `45^(@)` and height is 30.05 cm then approximate volume of cone is 9045.08 `pi`c.c
Reason(R ): When semi vertical angle is `45^(@)` approximate error in volume is `deltav=pir^(2)deltah`

Options

A. A is false R is true
B. A is true R is false
C. A,R are true and `RrArrA`
D. A,R both false

Answer

A