I saw this in one of the new questions, does anyone know how to solve? Sub in x values and graph?

Thanks

I saw this in one of the new questions, does anyone know how to solve? Sub in x values and graph?

Thanks

See GRE Medium Quant Practice - July 12, 2021 in New Content Feed - GregMat, around the 48 minute mark.

The question says that we need to find the area embedded in the graph, but half the circumference has an open side(ie the diameter of the circle),

So does option 4 make more sense ??

@Leaderboard

No. The circle is closed since the question clearly mentions that A is embedded with respect to the x-axis.

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It is a circle equation with radius 2. So A=2*Pi B=8 or A=Pi B=4. Which ones bigger? The answer is B