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≈ 15.70 cm

L = πr·n°/180°

n = 180° - 66.4° = 113.6°

L = 3.14×7.9×113.6/180

= 2817.9616/180

= 15.6553

≈ 15.70 cm

Critical point is at (-1, 2) because it is the point where the slope is approximately zero.

Step-by-step explanation:

A critical point in a graph like this is simply the point where the slope is zero or undefined.

Looking at the graph given, the point at which the graph slope is zero is around the coordinate (-1, 2).

So we estimate that to be the critical point.