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Its diameter is: 2*4.2 = 8.4 cm

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9y ago

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What is the circumference of a circle if the radius is 42 cm?

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What is the diameter if the radius is 42 cm?

In the case of a circle, or spehere, the diameter is twice the radius.


What is the area of a circle with a radius of 4 cm?

Area of a circle = pi x (radius)2So, if the radius is 4 cm, the area is pi x 42= 50.265 cm2


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If it is a 7.1 cm radius circle, then its radius is exactly 7.1 cm!


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If a circle has a circumference of 16 cm then what is the radius of the circle?

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The diameter of a circle is twice its radius. Thus the radius of a circle is half its diameter. → a circle with a diameter of 15 cm has a radius of 15/2 cm = 7.5 cm


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1/2*3.14*42 =25.12 sq.cm if the radius is 4 cm


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