Aplane is an undefined term because it
a: can be named using three noncollinear points

b: is described generally, not using a formal definition

c: is where other geometric shapes can be constructed

d: is a flat surface that extends indefinitely in all directions

Can someone tell me if this is perpendicular? !

*let m∠cob = 50°30’, m∠aob = 70° and m∠aoc = 20°30’. could point c be in the interior of ∠aob? why?

Over the course of the school year, you keep track of how much snow falls on a given day and whether it was a snow day. your data indicates that of twenty-one days with less than three inches of snow, five were snow days, while of the eight days with more than three inches of snow, six were snow days. if all you know about a day is that it is snowing, what is the probability that it will be a snow day?