Indirect proofs are a very useful tool, not just in geometry, but in many other areas - making it possible to prove things that would be hard or impossible to prove otherwise. An example outside of geometry is the fairly simple proof, often found in high school algebra textbooks, that the square root of 2 is not a rational number.
No.
Starting from around 3rd-4th grade, you start to learn really basic geometry. But around 8th or 9th grade, you actually start to learn more advanced geometry that uses theorems and postulates and proofs.
i need to know the answer
it is not important
Euclid
Obviously?...
A proof in geometry is basically proving a specific thing, like this segement is congruent to this, or proving something is a parallelogram....there are all sorts of very different kinds of proofs. Proofs have to be logical to everyone, and following a reasonable thinking path, using definitions, postulates, and theorems as reasons along the way. Most commonly written in paragraph form(in the real world) and 2-column proofs in middle/high school, apparently to organize your thinking when you first start doing them. An indirect proof is a way to do some proofs, like if it asks you to prove AX is not congruent to XY, then you would assume it is, and see how it goes from there, till you find a contradiction, and so the original assumption you made is false.
Asiya Mahmood webheath estate
Practice them. You need to do many of them and do them over and over again.
An indirect proof is a proof by contradiction.
The book was written originally about geometry but mostly had theories and proofs
The book Elements contained axiomic proofs for plane geometry.