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Remember and commit to memory.
C = 2 pi r or C = pi d
A = pi r^(2)
Where C = Circumference
A = Area
pi is a constant at 3.1416
r = is the radius
d is the dianter ; 2r = d
r^(2) = r x r = 'r' squared.
So selecting r = 7 inches
Then C = 2* (3.1416)* 7
C = 14*3.1416
C = 43.98229....
C ~ 43.99 inches.
NB In school you may be given pi =
pi = 3.14, 3.1416, 22/7
These are only approximations, but given for ease of calculating.
pi = 3.141592.... Is an irrational number and the decimals recur to infinity, AND are in no regular numerical order.
What else can I help you with?
What is the circumference of a circle if the radius is 27 inches?
The circumference of a circle if the radius is 27 inches is: about 169.6 inches. (you can do this type of calculation for other circles using this formula: r x 2 x Pi = circumference).
What is the relationship between the radius of a circle and the circumference?
any circles circumference divided by its diameter will equal pi, or 3.14159 approximately
What is thr relationship between pi and circles?
Circumference of a circle is 2 x Pi x the radius
What does pi mean?
Pi (3.14) times the radius of a circle squared, equals the circumference of a circle.
Is it true all circles with radius o Cm have circumferences of the same length?
No, it's not true that all circles with a radius of 0 cm have circumferences of the same length because a circle with a radius of 0 cm is actually just a point. A point does not have a circumference, as circumference is defined for circles with a positive radius. Therefore, circles with a radius of 0 cm do not exist in the traditional sense of geometry.
How do you find the circumference of circles?
The circumference of a circle = pi*diametre = 2pi*radius
How big of circles can you calculate their circumference?
Any circle's circumference can be calculated with the formula 2(pi)*radius
Why is Pi used to calculate circumference and area of circles?
pi is an irrational number at 3.141592.... ( recur to infinity and decimals in no regular order. Let me tell you a story!!!! It was found by the 'Ancient Civilisations' that when a donkey is used to drive up water from well, it was tethered to a rope/halter, the radius. It walked round the well head tied to the halter. in a big circle, the circumference. It was found by the ancients, that twice the radius, the diamter, has a direct proportion to the circumference. It didn't how big/small the circumference was, compared to the radius/diameter the proportion always remained the same at 3.141592.... (pi). So the ancints constructed an equation. C is directly proportional to diameter ,d, This proportion is always constant hence a 'k' for constancy is inserted. C = kd or k = C/d This constant 'k' was given the name 'pi', which is the lower case Classical Greek letter 'p'. and stands for proportion. So ther you have it!!!!!
How is pi used to find the circumference of circles?
Circumference of any circle = 2*pi*radius or pi*diameter
What is the circumference of a circle if the radius is 27 inches?
The circumference of a circle if the radius is 27 inches is: about 169.6 inches. (you can do this type of calculation for other circles using this formula: r x 2 x Pi = circumference).
What is the relationship between the radius of a circle and the circumference?
any circles circumference divided by its diameter will equal pi, or 3.14159 approximately
How do you make a project?
area of the circle is half the product of its circumference and radius by coiling method (for 10 circles of different radius).
How do you find a circles radius when they only tell you the circumference of the circle?
Divide by pi and then divide by 2
What is circumference of a circle in terms of pi?
The circumference of a circle is 2 pi r, where r is the radius, or it is pi d, where d is the diameter.there is no circuference of pi. Circumference refers to the outer edges of circles
What is thr relationship between pi and circles?
Circumference of a circle is 2 x Pi x the radius
What does pi mean?
Pi (3.14) times the radius of a circle squared, equals the circumference of a circle.
Is it true all circles with radius o Cm have circumferences of the same length?
No, it's not true that all circles with a radius of 0 cm have circumferences of the same length because a circle with a radius of 0 cm is actually just a point. A point does not have a circumference, as circumference is defined for circles with a positive radius. Therefore, circles with a radius of 0 cm do not exist in the traditional sense of geometry.
