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Hello!
The area of a sector is a corresponding part of the circle area:
A = (pi*r^2)*(a/2pi) = r^2*(a/2),
where a is the sector's angle in radians.
Therefore r^2 = 2A/a = 48/a, r = sqrt(48/a).
a) r = sqrt(48/0.7) = approx. 8,28.
b) 110 degrees is (pi/180)*100 = 5pi/9 radians,
r = sqrt[48/(5pi/9)] = approx. 5,24.
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