Circumference
What is a circle?
• A circle is defined as a set of points equidistant from a given point.
Circumference
What is a radius?
• The radius of a circle is a segment that has an endpoint on the center and another on an endpoint on the circle.
Circumference
What is the diameter?
• A diameter is a straight line through the center and terminating in both directions on the circumference.
Circumference
What is the circumference?
• The circumference of a circle is the distance around the circle. You can think of it as the perimeter of a circle (periphery).
Circumference
How do we find the circumference?
• For all circles of all sizes the formula
• C = circumference, d = diameter,
and r = radius.€
C = 2πr......,or,......C = πd
Circumference
First we need to find (pi)!
Is it…..
3.1415926535897932384626433832795028841971693993751058209749445923078164062862089986280348253421170679821480865132823066470938446095505822172535…..?
What is ?
Circumference
How do we find π?
• π is found through the ratio of the circumference and the diameter. π is always approximately 3.14.
€
C
d≈ 3.14,...or......,
C
d≈ π
Circumference
The number of times you must travel along the diameter of the circle to go the same distance as all the way round the circle is known as Pi.
oncetwice
Since is a bit more than 3.
three times acrossand a little
bit more!
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