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Which of the following statements is INCORRECT about the circle?
Question

Which of the following statements is INCORRECT about the circle?

A.

The area of a sector = 12(arc length×R)\frac{1}{2} (\text{arc length} \times R)​.

B.

The length of an arc = central angle made by the arc360×πr2\frac{\text{central angle made by the arc}}{360^\circ} \times \pi r^2​​

C.

The radius of an incircle of an equilateral triangle of side 's' is s23\frac{s}{2\sqrt{3}}​​

D.

Circles are congruent if they have same radii while similar circles may have different radii.

Correct option is B

Solution:
The length of an arc =central angle made by the arc360×2πr\frac{\text{central angle made by the arc}}{360^\circ} \times 2\pi r

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