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Using the formula:
d = 2 r
Solving for r:
We can draw infinite lines that pass through the center of the circle with endpoints on the circumference of the circle. Hence, a circle can have countless number of diameters.
The diameter is twice the radius:
d = 2r = 2(8 cm)
d = 16 cm
An arc is a portion of a curve.
A diameter of a circle is any straight line segment that passes through the center of the circle and whose endpoints lie on the circle.
Hence, BD is the diameter in the image shown.
A circle's diameter is equal to twice its radius, or 2r.
If the area of circle is 100 π square feet, find the radius of the circle.
Using the formula:
A = π r^{2 }
100π = π r^{2 }
By cancelling π on both sides, we get:
100 = r^{2 }
Hence, r = 10 ft.
Using the formula:
d = 2 r
Solving for r:
Circumference of a circle whose radius is r is given by 2 π r
Here r=7 cm
Hence,
Circumference of the circle = 2 π (7)
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