# Question: a Find the radius of the circle if its sector

(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 sppeed of the car, in km/hour, if the wheels rotate at 180 revolutions per minute?

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

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