Question

The formula to find the area of a circle with radius r.

• A. ${\mathrm{\pi r}}^2$
• B. $2\mathrm{\pi r}$
• C. $2{\mathrm{\pi r}}^2$
• D. $\mathrm{\pi r}$

Answer 1

The correct option is A

${\mathrm{\pi r}}^2$

1. The area of a circle is the region occupied by the circle in a two-dimensional plane.
2. The area of a circle with a radius of r is${\mathrm{\pi r}}^2$.
3. Area: The area can be defined as the space occupied by the flat space or the surface of an object.
4. The unit of area is the square unit, such as m², cm², etc.

Hence, option A is correct.