Chapter 1

Hint 1/Comment: Volume of a sphere equals 4/3* r3. If a radius of a circle is increased by 60%, what factor is its area increased by? Hint 1/Comment: The area of a circle equals r2. Comment: As radius increases, the area increases by that factor squared. Find the circumference (in km) of 1/5 of a circle with the radius of 15 m. Hint 1/Comment: ................
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