The antonyms for "right-angled triangle" are "oblique triangle" and "acute triangle". Oblique triangles are triangles that don't have a right angle, while "acute triangle" is a triangle with three acute angles (less than 90 degrees). A right-angled triangle is a fundamental geometric shape with a 90-degree angle at one of its vertices. It has two sides called legs and one side opposite the right angle referred to as the hypotenuse. Right-angled triangles play a significant role in mathematics, physics, and engineering because of their unique properties. Understanding their antonyms can help students differentiate between different types of triangles and their properties.

What are the antonyms for Right-angled triangle?

• n.

  • shape
  • oblique triangle
  .

Famous quotes with Right-angled triangle

• As long as he could whisper, he would go on as he had begun, bluntly refusing to meet his creator with the admission that the creation had taught him nothing except that the square of the hypotenuse of a right-angled triangle might for convenience be taken as equal to something else. Every man with self-respect enough to become effective, if only as a machine, has had to account to himself for himself somehow, and to invent a formula of his own for his universe, if the standard formulas failed.

  Henry Adams
• In geometry the following theorems are attributed to him [Thales]—and their character shows how the Greeks had to begin at the very beginning of the theory—(1) that a circle is bisected by any diameter (Eucl. I., Def. 17), (2) that the angles at the base of an isosceles triangle are equal (Eucl. I., 5), (3) that, if two straight lines cut one another, the vertically opposite angles are equal (Eucl. I., 15), (4) that, if two triangles have two angles and one side respectively equal, the triangles are equal in all respects (Eucl. I., 26). He is said (5) to have been the first to inscribe a right-angled triangle in a circle: which must mean that he was the first to discover that the angle in a semicircle is a right angle. He also solved two problems in practical geometry: (1) he showed how to measure the distance from the land of a ship at sea (for this he is said to have used the proposition numbered (4) above), and (2) he measured the heights of pyramids by means of the shadow thrown on the ground (this implies the use of similar triangles in the way that the Egyptians had used them in the construction of pyramids).

  Thomas Little Heath

Related words & questions

Related words: right angle triangle, right triangle equation, right-angled triangle definition, right-angled triangle meaning

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