Before moving into perimeter let’s recall some knowledge about crucial features the circle.

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Center the CircleDiameter that CircleRadius the Circle
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Therefore the circumference is 88cm.

When the diameter is given instead the the radius we have an additional circumference equation.

Let ‘d’ it is in the diameter and also ‘r’ is the radius.


d = 2πr (two time radius same to diameter)

If the one of the one denoted by ‘c

c = 2πr

We can additionally write circumference of a one formula as,

c = 2πr

c = π x d (d = 2πr)

c = πd


Find the circumference of the circle through the measurements provided below.

 Radius 7cm Diameter 28m (hint: convert into combined number) Diameter 17 1/2cm Radius 10.5m

*Answers are provided at the finish of this article.


When a one lamina separated right into two equal components along a diameter each component is recognized as a semicircle.


It is clear from the figure that, to find the perimeter of a semicircle, the diameter need to be added to the arc length.


Find the perimeter that the semi-circular lamina through the measurements given below.

Radius = 14cmDiameter = 7cm

*Answers are provided at the end of this article.


It is clean from the number that, to uncover the perimeter the a quarter circle, two radii should add to the arc length.

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The angle subtended at the center of the circle by the arc is called the central angle. 

Here the central angle is ‘θ


Radius, diameter, Perimeter and area calculation alternative are available. Select what you must find and also enter the number in text box. Then click ‘submit’. 


Always psychic this calculator is just checking for her answers. You have to do the exercises her self.


….so E1Q3? you asked “Find the circumference of the circle with the measurements Diameter 1712cm” am I appropriate thinking the should have been d=17-1/2?


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