Pythagoras' Theorem
Thus, if the hypotenuse, the side opposite the right angle, has length c and the other two sides have lengths a and b, then a2 + b2 = c2. One elegant proof is obtained by dividing up a square of side a + b in two different ways as shown in the figure, and equating areas.
Triangles leave area c2
Triangles leave area a2 + b2
Pythagoras's Theorem is a special case of the cosine rule.
- De Morgan's laws
- De Morgan's laws
- denominator
- dense matrix
- dense set
- density
- denumerable
- dependent equations
- dependent events
- dependent variable
- dependent variable
- depression
- derangement
- derivative
- derivative test
- derived function
- derived series
- derived set
- derived unit
- Desargues, Girard
- Desargues' Theorem
- Descartes, René
- describe
- descriptive geometry
- descriptive statistics