The diameter of a circle is 28cm. Find the one-fourth of its area.
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Q3
The area of a circle is 616cm2. Find its circumference.
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Q4
The diameter of a circle is 28cm. Find its circumference.
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Q5
The surface area of a solid metallic sphere is 616 cm2. It is melted and recast into a cone of height 28 cm. Find the diameter of the base of the cone so formed. (Use ~\pi = \frac{22}{7}).