UPSKILL MATH PLUS

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Let us recall the fundamentals of circles which we studied in previous chapters.
Circle:
A closed line consisting of all points on the plane that are equidistant from a given point on the plane is called a circle.
Diameter of the circle:
• The distance across the circle.
• The length of any chord (a straight line which connects two points on a circle) passing through the center.
• It is twice the radius.

Diameter $$=$$ $$2 ×$$ Radius $$=$$ $$2r$$

The radius is the distance from the center to any point on the circle.

Radius is also known as half of the diameter.

$\mathrm{Radius}=\frac{\mathrm{Diameter}}{2}$

Area of the circle:
The area of a circle is the number of square units inside that circle.
Area of the circle $$=$$ $\mathrm{\pi }{r}^{2}$ sq. units

Here $$r$$ is the radius of the circle.

The value of the $\mathrm{\pi }$ [pi] can be either $$22/7$$ or $$3.14$$.