Question

whats the differece between a indirect proof and a direct proof

Answer 1

Suppose the statement you want to show is A => B.

A direct proof is constructive and shows how to arrive at the result; i.e., it starts with A and derives B.

An indirect proof uses a different approach, by either
- proving the contrapositive: not B => not A
- arguing by contradiction. "Suppose A is true and B is not. Now show that leads to logical inconsistency."

Answer 2

One of the most famous proofs in mathematics is an example of an indirect proof:
Show that the square root of 2 is irrational.

Answer 3

On the other hand, something like Pythagorus Theorem is proved directly.

Answer 4

so u could use it with geometry

Answer 5

direct and indirect methods can be and are used in any field of mathematics, including geometry.

Answer 6

ok
for a direct proof would look like