circumference of circle is
Answers
Answer:
circumference of circle is C=2πr
Step-by-step explanation:
Circumference of the circle or perimeter of the circle is the measurement of the boundary of the circle. Whereas the area of circle defines the region occupied by it. If we open a circle and make a straight line out of it, then its length is the circumference. It is usually measured in units, such as cm or unit m.
When we use the formula to calculate the circumference of the circle, then the radius of the circle is taken into account. Hence, we need to know the value of the radius or the diameter to evaluate the perimeter of the circle.
Area of a Circle Formula
Area of any circle is the region enclosed by the circle itself or the space covered by the circle. The formula to find the area of the circle is;
A = πr2
Where r is the radius of the circle, this formula is applicable to all the circles with different radii.
Perimeter of Semi-Circle
The semi-circle is formed when we divide the circle into two equal parts. Therefore, the perimeter of the semi-circle also becomes half.
Hence, Perimeter = 2πr/2 = πr
Area of Semi-Circle
Area of the semi-circle is the region occupied by a semi-circle in a 2D plane. The area of the semi-circle is equal to half of the area of a circle, whose radii are equal.
Therefore, Area = πr2/2
Summary
Circumference of Circle 2πr
Area of circle πr2
Perimeter of semi-circle πr
Area of semi-circle πr2/2
Radius of a Circle
The distance from the centre to the outer line of the circle is called a radius. It is the most important quantity of the circle based on which formulas for area and circumference of the circle are derived. Twice the radius of a circle is called the diameter of the circle. The diameter cuts the circle into two equal parts, which is called a semi-circle.
What is the Circumference of Circle?
The circumference is the distance around a circle or any curved geometrical shape. It is the one-dimensional linear measurement of the boundary across any two-dimensional circular surface. It follows the same principle behind finding the perimeter of any polygon, which is why calculating the circumference of a circle which is also known as the perimeter of a circle.
A circle is defined as a shape with all the points are equidistant from a point at the centre. The circle depicted below has its centre lies at point A.
The value of pi is approximately 3.1415926535897… and we use a Greek letter π (pronounced as Pi) to describe this number. The value π is a non-terminating value.
For circle A (as given below), the circumference and the diameter will be-
Step-by-step explanation:
Circumference of Circle = 2πr