All of the rungs of a ladder are parallel and the top rung is perpendicular to a side of the ladder. What conclusion can be reached?

All rungs are perpendicular to a side of a ladder.
Step-by-step explanation:
The problem tells us that ALL the rungs of a ladder are parallel.
It also tells us that the top rung (which is a subset of all the rungs) is perpendicular to a side of the ladder.
But if this top rung is perpendicular to a side but we know that ALL rungs are parallel, then this top rung is also parallel to the other ones and therefore, all the other rungs are also perpendicular to a side of a ladder.

In a right-angled triangle: 1- the hypotenuse is the longest side2- we can apply pythagorean rule which states that: (hypotenuse)^2 = (side1)^2 + (side2)^2for the given triangle,longest side is 15 cm  side1 = 9 cmside2 is 12 cm  to check whether the triangle is right-angled or not,compare (15)^2 to the summation of (9)^2 and (12)^in other words, compare 225 to the summation of 81 and 144if they are both equal, then the triangle is right-angles, otherwise, it is not.you haven't provided the diagram showing her work, so i cannot tell the choice. however, apply my explanation to the question you have.