Question

subject -> maths
chapter-> circles

guys wanna help from you in one of the question
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Answer 1

Answer

Diameter is known as the longest chord of the circle.

Diameter ⇒ 2 × Radius

Diameter ⇒ 2R

Radius ⇒ 4 cm

Diameter ⇒ 4 × 2

Diameter ⇒ 8 cm

(Required circle attached.)

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Additional Information

Basic Information on Circles

• Circle is a closed polygons with no edges, corners, etc.  
• The perimeter of a circle is known as the circumference of the circle. Perimeter is the measure of the boundary.
• Diameter is known to be the longest chord of the circle which passes through the center of the circle.
• Radius is the half of the diameter.
• Chord is a straight line connecting the two points of a circle.

Properties of Circles

• Circles with equal radii are known to be congruent.
• Longest chord in a circle is the diameter.

Important Formulas For Circles

Circumference (Perimeter of Circle) ⇒ 2πr

Area of Circle ⇒ πr²

(r = Radius)

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Answer 2

diameter is known as the longest

diameter is known as the longestchord of circle.

Diameter = 2×Radius

Diameter=2r

Radius =4m

Diameter=4×2

Diameter=8cm

Good to Know for Knowledge

Basic information of circle.

A circle is all points in the same plane that lie at an equal distance from a center point. The circle is only composed of the points on the border. You could think of a circle as a hula hoop. It's only the points on the border that are the circle. The points within the hula hoop are not part of the circle and are called interior points.

The distance between the midpoint and the circle border is called the radius. A line segment that has the endpoints on the circle and passes through the midpoint is called the diameter. The diameter is twice the size of the radius. A line segment that has its endpoints on the circular border but does not pass through the midpoint is called a chordThe distance around the circle is called the circumference, C, and could be determined either by using the radius, r, or the diameter, d:

C=2πr

C=2πrC=πd

A circle is the same as 360°. You can divide a circle into smaller portions. A part of a circle is called an arc and an arc is named according to its angle. Arcs are divided into minor arcs (0° < v < 180°), major arcs (180° < v < 360°) and semicircles (v = 180°).

The length of an arc, l, is determined by plugging the degree measure of the Arc, v, and the circumference of the whole circle, C, into the following formula:

l=C⋅v360