Does anyone know what does this mean?

I believe the textbook is telling you which rounded version of pi () to use when solving questions regarding the geometry of circles. This is not a definite answer, as the question you asked is not completely clear cut. It is only my best attempt to interpret what your textbook means.

i would say the third one.

step-by-step explanation: liner would mean in a line and the only one that doesn't look like it's even thinking about forming a line would be the third one

452,489 to the nearest thousand is 452,000