a straight line extending from the center of a circle or sphere to the circumference or surface: The radius of a circle is half the diameter. the length of such a line.

What is radius in geometry example?

The radius of a circle is the distance from the center of a circle to any point on the circle. If you place two radii end-to-end in a circle, you would have the same length as one diameter. Thus, the diameter of a circle is twice as long as the radius.

How do you find the radius in geometry?

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.

What is radius used for in math?

Radius is the length from the midpoint of the circle to the outer edge of the circle. The radius is represented by the lowercase letter r.

1: a line segment extending from the center of a circle or sphere to the circumference or bounding surface. 2 a: the bone on the thumb side of the human forearm also: a corresponding part of vertebrates above fishes. b: the third and usually largest vein of an insect’s wing.

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noun, plural ra·di·i [rey-dee-ahy], ra·di·us·es. a straight line extending from the center of a circle or sphere to the circumference or surface: The radius of a circle is half the diameter. the length of such a line. any radial or radiating part.

How do you find the radius in general form?

Remember that the circle formula is (x – h)2 + (y – k)2 = r2. If you end up with an equation like (x + 4)2 + (y + 5)2 = 5, you have to keep straight that h and k are subtracted in the center-radius form, so you really have (x – (–4))2 + (y – (–5))2 = 5. That is, the center is at the point (–4, –5), not at (4, 5).

The diameter is a straight line that passes through the center of the circle. The radius is half of the diameter. It starts from a point on the circle, and ends at the center of the circle.

What is a radius of a circle class 9?

The radius of a circle is the length of the line from the centre to any point on its edge.

Radius of the circle we use for the singular term and radii word is used to indicate plural.

What does 5 mile radius mean?

the radius (of a circle): the distance from the center of a circle to its edge. noun. (There are 3 bakeries) within a 5-mile radius (of my house): (There are 3 bakeries) less than 5 miles away (from my house) idiom.