What part of this circle is shaded blue?
The correct answer is "0.2."
Given the circle below:
We observe that 2 out of 10 parts are colored blue.
That is, the part shaded blue in the circle is two tenths.
We write two tenths as a decimal.
Two tenths is written as the decimal 0.2.
So, 0.2 part of the circle is shaded blue.