Question #b9d1a

1 Answer
Jo S.
Nov 3, 2017

The arc length is piπ.

Explanation:

Squaring both sides of this equation gives y^2=1-x^2y2=1−x2 and a little rearrangement shows this to be a circle with centre (0, 0)(0,0) and radius 1.
The radical sign sqrt√ defines only the positive value of the bracket, so we're looking at just the half circle where y is positive.
Using half of 2pi r2πr, we get a result of piπ.

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