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Earn +20 ptsQ: What is the diameter of a circle if its radius is 15cm?
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What is the circumference of a circle with a radius of 15cm?
double the radius to get the diameter = 30 multiply by pi (3.1415...) = 92.245 cm
What is the circumference of a circle with the diameter of 15cm?
The formula for the circumference of a circle is C = 2πr where r is the radius. This formula can also be expressed as C = πd where d is the diameter as the diameter is twice the radius. C = 15π = 47.12cm (2dp)
What is the radius of a circle if the circumference is 8cm?
The radius is 1.27cm
How do the the radius and diameter of a circle compare?
The diameter of a circle is twice its radius
If the radius of a circle is r what is the diameter of the circle?
The radius of a circle is half the diameter so if the radius of a circle is r, then the diameter is 2r.
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