Mathematics · Geometry
Which of the following statements is INCORRECT about a circle?
- 1Circles are congruent if they have the same radii, while similar circles may have different radii
- 2The length of an arc = central angle360° × πr2✓
- 3The area of a sector = 12 × (arc length × radius)
- 4The radius of an incircle of an equilateral triangle of side 's' is s / 2√3
Correct answer
The length of an arc = central angle360° × πr2
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