- What is the formula for finding radius of a circle?
- Is a point a circle?
- Can an area be negative?
- Is it possible for a circle to have a radius equal to 0 Why or why not?
- What is a point on a circle called?
- Can a circle be perfect?
- What is standard form of a circle?
- What is the definition for radius?
- What do we call a circle with a radius of 0?
- Can a circle have a negative radius?
- Does a circle have a radius?
- How do you find the radius?

## What is the formula for finding radius of a circle?

Lesson Summary The two formulas that are useful for finding the radius of a circle are C=2*pi*r and A=pi*r^2.

We use algebra skills in solving for our variable r..

## Is a point a circle?

A point “circle” is just a point; it’s a circle with a radius of zero (hence a degenerate circle). An imaginary circle is one in which the radius is the square root of a negative number—i.e., imaginary.

## Can an area be negative?

Area can’t be negative. If the problem is finding the value of the integral, the result is ok to be negative.

## Is it possible for a circle to have a radius equal to 0 Why or why not?

In our scale, we use in daily life, radius of circle can be taken as zero. … There are too many other things that would no longer work in that case, for example – theorems about tangents to a circle they specify that the radius has to be greater than zero. Standard equation of circle: x^2+y^2=r^2. if r=0, x=y=0.

## What is a point on a circle called?

A circle is a set of all points in a plane that are all an equal distance from a single point, the center. The distance from a circle’s center to a point on the circle is called the radius of the circle. … A line segment that crosses the circle by passing through the center of the circle is called the diameter.

## Can a circle be perfect?

For a circle to be perfect, we would need to measure an infinite number of points around the circle’s circumference to know for sure. Each point would need to be precise from the particle level to the molecular level, whether the circle is stationary or in motion, which makes determining perfection a tricky feat.

## What is standard form of a circle?

The graph of a circle is completely determined by its center and radius. Standard form for the equation of a circle is (x−h)2+(y−k)2=r2. The center is (h,k) and the radius measures r units.

## What is the definition for radius?

1 : a line segment extending from the center of a circle or sphere to the circumference or bounding surface. 2a : the bone on the thumb side of the human forearm also : a corresponding part of vertebrates above fishes.

## What do we call a circle with a radius of 0?

pointA circle with a radius of 0 is just a point.

## Can a circle have a negative radius?

Radius of the circle is the distance from the center of a circle to a point on the circle. As distance is a scalar quantity it don’t have any direction. So radius of a circle cannot be negative. … Imagine a circle having a positive radius, say r = 5.

## Does a circle have a radius?

One textook defines a circle as the set of points that is equidistant from a center point and that the radius is greater than or equal to zero.

## How do you find the radius?

Just remember to divide the diameter by two to get the radius. If you were asked to find the radius instead of the diameter, you would simply divide 7 feet by 2 because the radius is one-half the measure of the diameter. The radius of the circle is 3.5 feet.