- Wyrd Sisters (Wikipedia)
Wyrd Sisters is Terry Pratchett’s sixth Discworld novel, published in 1988. It re-introduces Granny Weatherwax of Equal Rites.
- Right triangle (Wikipedia)
A right triangle or right-angled triangle, sometimes called an orthogonal triangle or rectangular triangle, is a triangle in which two sides are perpendicular forming a right angle (1⁄4 turn or 90 degrees).
