Table of Contents

## What is an origin of a circle?

Origin: the center of a circle. Radius: the distance from the center of a circle to any point on it. Diameter: the longest distance from one end of a circle to the other.

**How is circle equation derived?**

A circle is the set of all points in a plane at a given distance (called the radius ) from a given point (called the center.) The equation of a circle with center (h,k) and radius r units is (x−h)2+(y−k)2=r2 . …

### Who invented the equation of a circle?

1650 BC) gives us insight into the mathematics of ancient Egypt. The Egyptians calculated the area of a circle by a formula that gave the approximate value of 3.1605 for π. The first calculation of π was done by Archimedes of Syracuse (287–212 BC), one of the greatest mathematicians of the ancient world.

**What is a quarter of a circle called?**

What Is a Quarter Circle (Quadrant)? The area (or) portion that is formed by two radii that are perpendicular to each other and one-fourth portion of the circumference of a circle is known as a quarter circle. This is also known as a quadrant of a circle.

## Is the sun a perfect circle?

The sun is the most perfectly round natural object known in the universe, say scientists who have conducted precise measurements of its dimensions. As a spinning ball of gas, astronomers had always expected our nearest star to bulge slightly at its equator, making it very slightly flying-saucer shaped.

**What is the formula of x2 y2 z2?**

The equation x2 + y2 = z2 is associated with the Pythagorean theorem: In a right triangle the sum of the squares on the sides is equal to the square on the hypotenuse. We all learn that (3,4,5) is a “Pythagorean triple”: 32 + 42 = 52.

### Which is the general equation for a circle centered at the origin?

Using the Pythagorean Theorem, we can write the equation: x 2 + y 2 = r 2 This is the general equation of a circle that is centered at the origin.

**When do we know the equation of a circle?**

We know that the equation of a circle when the centre is origin: x2+ y2 = a2 For the given condition, the equation of a circle is given as x2 + y2 = 8 2

## Which is the standard form for the equation of a circle?

which is called the standard form for the equation of a circle. Equation of a Circle in General Form. The general equation of any type of circle is represented by: x 2 + y 2 + 2 g x + 2 f y + c = 0, for all values of g, f and c. Adding g 2 + f 2 on both sides of the equation gives,

**How to calculate the radius of a circle?**

The equation of a circle with center the origin (0,0), and radius r, is: This equation comes from the Distance Formula. The distance of the radius, which is a straight line, from the central point (0,0) to another point on the edge of the circle (x,y), is given from the distance formula by: r 2 = (x − 0) 2 + (y − 0) 2

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