WOLFRAM|DEMONSTRATIONS PROJECT

Three Proofs of the Pythagorean Theorem

​
a
b
rotation for proof 3
proofs
1
2
3
Proof:
area of four triangles +
area of middle square =
area of whole square

4 ​
1
2
a b) + (b - a
2
)\),
=
2
c

2 a b + (
2
b
- 2 a b +
2
a
) =
2
c

2
a
+
2
b
=
2
c
This Demonstration shows three different proofs of the Pythagorean theorem using four congruent triangles.