Question

read the sentences below. click or tap the underlined phrase that best helps the reader understand the meaning of the word diagonal. trina is cutting out two equal triangles from a square piece of paper. to do this, she first uses a ruler to draw a diagonal line. the line goes from the upper left to the lower right corner. then she uses scissors to cut along that line.

Explanation:

The phrase "the upper left to the lower right corner" describes the direction and path of the diagonal line, which directly helps in understanding what a diagonal is.

Answer:

the upper left to the lower right corner