## What is the standard form of an equation of a circle?

First you need to know that the equation for a circle is (x-a)^2 + (y-b)^2 = r^2 where the center is at point (a,b) and the radius is r. so for instance (x-2)^2 + (y-3)^2 = 4 would have the center at (2,3) and have a radius of 2 since 4 = 2^2.

**What is the radius of a 7 inch circle?**

The radius of this circle is 7 inches, so the diameter is 2(7) = 14 inches….

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Problem | Find the radius of the circle. | |

The radius is half the diameter, or . The diameter of this circle is 36 feet, so the radius is feet. | ||

Answer | The radius is 18 feet. |

### What is the radius of the diameter is 4?

Use the diameter to find the radius by dividing the diameter by 2. For example, if the diameter is 4, the radius would be 2.

**How do you find the standard form of an equation?**

You are probably already familiar with the slope-intercept form of a line, y = mx + b. The standard form is just another way to write this equation, and is defined as Ax + By = C, where A, B, and C are real numbers, and A and B are both not zero (see note below about other requirements).

## What does πr2 mean?

4. Area of a Circle. The area of a circle is pi times the radius squared. A=πr2.

**How do I find the radius of a circle from the area?**

how do you find the radius of a circle if you only know the area of the circle. Do you somehow reverse the Pi formula. and hence if you know A, divide it by π and then take the square root to find r.

### What is a standard form in math?

Standard form is a way of writing down very large or very small numbers easily. 103 = 1000, so 4 × 103 = 4000 . So 4000 can be written as 4 × 10³ . This idea can be used to write even larger numbers down easily in standard form.

**How do you write percentages in academic writing?**

As for percentages specifically, APA has this to say:

- Use the percent symbol after any number expressed as a numeral.
- Use the word “percent” after any number expressed as a word.
- Use the word “percent” after any number that begins a sentence, title or text heading.

## What is the radius of the diameter is 9?

The area of a circle is represented by the formula A=πr2 . If the diameter is 9cm , the radius is 4.5cm .

**What is the radius of a half circle?**

As the perimeter of a circle is 2πr or πd. So, the perimeter of a semicircle is 1/2 (πd) + d or πr + 2r, where r is the radius….Semi Circle Shape.

MATHS Related Links | |
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Faces Edges And Vertices | Prime Number |

### Is radius half of diameter?

Half of the diameter, or the distance from the midpoint to the circle border, is called the radius of the circle (r).

**How do you read standard form?**

The standard form for linear equations in two variables is Ax+By=C. For example, 2x+3y=5 is a linear equation in standard form. When an equation is given in this form, it’s pretty easy to find both intercepts (x and y).

## What does Standard Form tell you?

An equation written in standard form is yet another equation that forms a parabola when graphed. Each letter in the standard form equation tells us a piece of information about the parabola, just like the letters from the vertex form equation had. “a”, can also tell us the width of a parabola. …

**How do you write an equation for a circle on a graph?**

The center-radius form of the circle equation is in the format (x – h)2 + (y – k)2 = r2, with the center being at the point (h, k) and the radius being “r”. This form of the equation is helpful, since you can easily find the center and the radius.

### How are numbers written in scientific writing?

Using Numbers in Scientific Manuscripts

- Do not start a sentence with a numeral. When writing for publication, try to use spelled-out numbers at the beginning of a sentence in place of numerals.
- Be consistent in the use of numerals or spelled-out numbers.
- Other tips for consistency with numerals.

**How do you figure out a diameter?**

The radius is the length from the center of a circle to the edge. Therefore, if you know the radius, multiply it by two to determine the diameter (diameter = 2 x radius).

## Whats the radius of a circle?

The radius of a circle is the length of the line from the center to any point on its edge. The plural form is radii (pronounced “ray-dee-eye”). In the figure above, drag the orange dot around and see that the radius is always constant at any point on the circle.

**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. You can also use the circumference and radius equation.

### What are the parts of standard form?

The standard form of an equation is Ax + By = C. In this kind of equation, x and y are variables and A, B, and C are integers. When we shift the variable terms to the left side of the equation and everything else to the right side, we get . This equation is now in standard form.