A triangle with a right angle.
- ‘To fit the National Gallery's East Building on a trapezoid-shaped site, architect I.M. Pei based his design on a division of a trapezoid into an isosceles triangle and a smaller right triangle.’
- ‘Indeed, if there is one thing that someone might remember from grade school mathematics, it's the fact that ‘the square of the hypotenuse of a right triangle is equal to the sum of the squares of the two adjacent sides.’’
- ‘Using the Pythagorean Theorem, it is not hard to prove that the ratio of the hypotenuse of an isosceles right triangle to either of its two shorter sides cannot be expressed in whole numbers.’
- ‘The base of the wedge is an isosceles right triangle in a vertical plane.’
- ‘Subsequent chapters deal with such issues as computing volumes, the mathematics of taxation, square and cube roots, and calculations with right triangles.’