Aplane is an undefined term because ita: can be named using three noncollinear pointsb: is described generally, not using a formal definitionc: is where other geometric shapes can be constructedd: is a flat surface that extends indefinitely in all directions

Answer and Explanation:   In geometry, we can define plane as a flat surface with no thickness. The surface extends with no ends. A plane does not have any edges even if we draw it on paper with edges, it does't mean it has edges.

Hence,

The best answer is Option B.

A plane is an undefined term because it is described generally, not using a formal definition.

answer: 7 x 2/5 = 2.8 hours, is your answer. your welcome! : 3

step-by-step explanation: first work out how long it took to hose 1/7 of the lawn which is 2/5 hours. times that by 7 to get the whole lawn.

sorry i don't know the other answer. i didn't learn what a proportional relationship is.