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The angle measured is 1.72 radians

Solution:

Given that radius is 9 units and arc length is 15.5 units

To find: angle, , in radians

The length of arc when angle in radians is given as:

Where, "r" is the radius and "s" is the arc length

is central angle measured in radians

Substituting r = 9 and s = 15.5 in above formula,

Thus the angle measured is 1.72 radians

step-by-step explanation:

c

step-by-step explanation: