MCQ 11 Mark
Assertion (A) : If the radius of sector of a circle is reduced to its half and angle is doubled then the perimeter of the sector remains the same.
Reason (R) : The length of the arc subtending angle $\theta$ at the centre of a circle of radius $r$ $=\frac{\Pi r \theta}{180}$.
Reason (R) : The length of the arc subtending angle $\theta$ at the centre of a circle of radius $r$ $=\frac{\Pi r \theta}{180}$.
- ABoth assertion (A) and reason (R) are true and reason (R) is the correct explanation of assertion (A)
- BBoth assertion (A) and reason (R) are true and reason (R) is not the correct explanation of assertion (A)
- CAssertion (A) is true but reason (R) is false
- ✓Assertion (A) is false but reason (R) is true.
Answer
View full question & answer→Correct option: D.
Assertion (A) is false but reason (R) is true.
(D)Assertion (A) is false but reason (R) is true.