Table of Contents
- 1 How do you find the radius if you know the area?
- 2 What is the easiest way to find the radius of a circle?
- 3 Where is the diameter located on a circle?
- 4 How do you find the radius of a circle with 3 points?
- 5 How do you find the area of a circle equation?
- 6 How to find the equation of circle with diameter endpoints?
How do you find the radius if you know the area?
To find the radius, divide the area by pi, then take the square root.
What is the easiest way to find the radius of a circle?
radius is always half the length of its diameter. For example, if the diameter is 4 cm, the radius equals 4 cm ÷ 2 = 2 cm.
How do you find the radius of a circle without knowing the diameter?
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 does a radius look like?
A radius is a straight line from the center of a circle to the circumference of a circle. If you have two or more of them, they are referred to as radii. All radii in a circle will be the same length. A radius can be a line from any point on the circumference to the center of the circle.
Where is the diameter located on a circle?
The diameter is the length of the line through the center that touches two points on the edge of the circle.
How do you find the radius of a circle with 3 points?
Equation of circle in general form is x² + y² + 2gx + 2fy + c = 0 and in radius form is (x – h)² + (y -k)² = r², where (h, k) is the centre of the circle and r is the radius.
How do you find the approximate area of a circle?
To find the area of a circle, you take pi times the radius squared, or A = pi r^2. Using this formula, you can find the area of a circle if you know the radius — or the diameter — by plugging in your values and solving for A. Pi is approximated as 3.14.
How to find center of circle with equation?
The equation of a circle is (x-h)²+ (y-k)²=r². The coordinates for the center of the circle are (h, k), so to find the center of the circle, solve for h and k.
How do you find the area of a circle equation?
The formula for the area of a circle is π x radius 2, but the diameter of the circle is d = 2 x r 2, so another way to write it is π x (diameter / 2) 2.
How to find the equation of circle with diameter endpoints?
The equation of the circle through the ends points of its diameter is (x – x 1) (x – x 2) + (y – y 1) (y – y 2) = 0 Here from the given points we have values x 1 = 5, x 2 = 1, y 1 = 7, y 2 = 3 Now substitute these values of the given points in the above equation of a circle as