Algenib and Algol form with γ Andromedæ, a right-angled triangle.
Of the measuring of right lines by like right-angled Triangles.
"Oh, that's all right-angled," said Freddy, taking the hint and rising.
The employment of a right-angled isosceles triangle has also been suggested, but is not in general use.
The little stream at this point makes a right-angled turn, and thus ...