The radius of a circle is 4. The diameter is 8. The radius of a triangle is 8. The diameter is 16. Which shape has the least amount of square feet?

 

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Helium (density 0.18 kg/m^3 at 0°C and 1 atm pressure) remains a gas until the extraordinarily low temperature of 4.2 K.What is the speed of sound in helium at