In the diagram the arc length is is l and the sector area is A. a) Find theta, if r = 5cm and l = 7.5cm b) Find theta, if r = 2m and A = 2m^2 c) Find r, when theta = 55º and l = 6cm.
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a,theta= (360×l)/2πr
r=(360×l)/(2π×theta)
theta=(A×360)/πr^2
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