Find the radius of the circle if its sector with a central

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(a) Find the radius of the circle if its sector with a central angle θ = ½ radian has an area A = 9m2.

(b) A car's wheels are 70cm in diameter. What is the speed of the car, in km/hour, if the wheels rotate at 180 revolutions per minute? 

Reference no: EM13993241

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