eight different parts

Important Circle Parts

• Radius: The distance from the center of the circle to its outer rim.
• Chord: A line segment whose endpoints are on a circle.
• Diameter: A chord that passes through the center of the circle.
• Secant: A line that intersects a circle in two points.

Names of parts of a circle

• Centre.
• Radius.
• Diameter.
• Circumference.
• Tangent.
• Secant.
• Chord.
• Arc.

In geometry, a chord is often used to describe a line segment joining two endpoints that lie on a circle. It turns out that a diameter of a circle is the longest chord of that circle since it passes through the center. A diameter satisfies the definition of a chord, however, a chord is not necessarily a diameter.

The formula for the chord length is: 2rsin(theta/2) where r is the radius of the circle and theta is the angle from the centre of the circle to the two points of the chord

The symbol or variable for diameter, ⌀, is sometimes used in technical drawings or specifications as a prefix or suffix for a number (e.g. “⌀ 55 mm”, indicating that it represents diameter.

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

It is the longest possible chord of any circle. The center of a circle is the midpoint of its diameter. That is, it divides it into two equal parts, each of which is a radius of the circle. The radius is half the diameter.

The diameter symbol (⌀) (Unicode character U+2300) is similar to the lowercase letter ø, and in some typefaces it even uses the same glyph, although in many others the glyphs are subtly distinguishable (normally, the diameter symbol uses an exact circle and the letter o is somewhat stylized).

Though not its native name, among English-speaking typographers the symbol may be called a “slashed o” or “o with stroke”. Although these names suggest it is a ligature or a diacritical variant of the letter o, speakers of languages which use the letter ø hold that it is not

Ø = Hold down the Control and Shift keys and type a / (slash), release the keys, hold down the Shift key and type an O.

opposite/hypotenuse

Ø is the diameter of a circle.

An element of a set is an object directly contained within that set. Two sets are equal if they contain the same elements. For example, we have that {1, 2} = {2, 1} and that {Ø} = {Ø}

Theta (uppercase Θ / lowercase θ), is a letter in the Greek alphabet. It represents the “th” sound (as in “think”) in Ancient and Modern Greek. In mathematics, the lowercase θ is used as a variable to represent an angle, and the uppercase Θ is used in big-theta notation (a variant of big-O notation).

In ancient times, Tau was used as a symbol for life or resurrection, whereas the eighth letter of the Greek alphabet, theta, was considered the symbol of death.

Lambda (uppercase/lowercase Λ λ) is a letter of the Greek alphabet. It is used to represent the “l” sound in Ancient and Modern Greek. In mathematics, the lowercase λ is used as a variable for eigenvalues in linear algebra, and as the parameter of both exponential distribution and Poisson distribution.

symbol ∠

symbol ∼

The reference angle is the positive acute angle that can represent an angle of any measure. The reference angle is always the smallest angle that you can make from the terminal side of an angle (ie where the angle ends) with the x-axis. A reference angle always uses the x-axis as its frame of reference.

An angle can be measured using a protractor, and the angle of measure 90 degrees is called a right angle. In a right angle, the two arms are perpendicular to each other. When the right angle is divided into two equal parts each angle measures 45°.

In geometry, there are various types of angles, based on measurement. The names of basic angles are Acute angle, Obtuse angle, Right angle, Straight angle, reflex angle and full rotation. An angle is geometrical shape formed by joining two rays at their end-points. An angle is usually measured in degrees

Different Types of Angles

• Zero Angles.
• Acute Angles.
• Right Angles.
• Obtuse Angles.
• Straight Angles.
• Reflex Angles.
• Complete Angle.

Angles: Acute, Obtuse, Straight and Right There are four types of angles depending on their size in degrees

Angles larger than a straight angle but less than 1 turn (between 180° and 360°) are called reflex angles. An angle equal to 1 turn (360° or 2π radians) is called a full angle, complete angle, round angle or a perigon.

A full angle, also called a complete angle, round angle, or perigon, is an angle equal to radians. corresponding to the central angle of an entire circle. Four right angles or two straight angles equal one full angle. SEE ALSO: Acute Angle, Angle, Central Angle, Obtuse Angle, Reflex Angle, Right Angle, Straight Angle.

We can measure Angles in Degrees. There are 360 degrees in one Full Rotation (one complete circle around).

Complete angle by a Line The angle made by the ray to reach its final position from its initial position is ∠ E C D and the amount of rotation is . ∠ E C D = 360 ∘ The angle E C D is . So, the angle E C D is an example for the complete angle. 2.