A diagonal is made out of a straight line that's set at an angle instead of straight up or across. Top synonyms for diagonally opposite (other words for diagonally opposite) are diametrally opposite, diametrically opposite each other and complete opposites. Diagonal: running in a slanting direction. What are synonyms for diagonally? Mathematics a. Synonyms for diagonally include obliquely, cornerwise, crosswise, aslant, kitty-corner, crossways, on the bias, athwart, bias and cater-corner. Horizontal is not the opposite at all, the opposite of horizontal is vertical (duh) diagonal adj. Antonyms for diagonal Antonyms for (adj) diagonal Main entry: diagonal Definition: connecting two nonadjacent corners of a plane figure or any two corners of a solid that are not in the same face Usage: a diagonal line across the page 7 synonyms for diagonally: aslant, obliquely, on the cross, at an angle, crosswise, on the bias, cornerwise. Search antonyms for word diagonal at EnglishThesaurus.net. As adjectives the difference between diagonal and opposite is that diagonal is (geometry) joining two nonadjacent vertices (of a polygon or polyhedron) while opposite is located directly across from something else, or from each other. Look it up now! if the teacher is talking about a diagonal on a graph, well then the opposite is the negative of the slope. I cannot imagine what else he would be talking about. A diagonal is a straight line connecting the opposite corners of a polygon through its vertex.To learn about diagonals, we must first know that: It (diagonal) is a line segment.. Polygons are plane figures having at least three sides and angles and usually, it is used to identify figures having five or more sides and angles.. Vertex is a corner of the shape. Find more similar words at wordhippo.com! Find another word for diagonal. What is Diagonal? d - diagonal, and two other parameters which are not shown in the picture: A - area, P - perimeter. Define diagonal. Well if you’re talking about a diagonal line then the opposite would be straight Here’s more: If you’re talking about a line at an angle then you’ve got even. Also you can find some other opposite words using the online search on our website. This name derives from the fact that a rectangle is a quadrilateral with four right angles (4 * 90° = 360°). 27 synonyms of diagonal from the Merriam-Webster Thesaurus, plus 4 related words, definitions, and antonyms. 1. Antonyms for diagonally. Diagonally Opposite synonyms. If the slope is 19, the opposite is -19. Diagonal definition at Dictionary.com, a free online dictionary with pronunciation, synonyms and translation. If you picture a square and draw a line connecting the opposite corners, that’s a diagonal line. Here you can find the antonyms list for the word diagonal. Synonyms for diagonally in Free Thesaurus. If the slope is 2, the opposite will be -2. 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