Proof In Geometry ( Little Mathematics Library) by A. I. Fetisov

The pupils often fail to understand why truths should be proved that seem quite evident without proof, the proofs often appearing to be excessively complicated and cumbersome. It sometimes happens, too, that a seemingly clear and convincing proof turns out, upon closer scrutiny, to be incorrect.

This booklet was written with the aim of helping pupils clear up the following points:
1. What is proof?
2. What purpose does a proof serve?
3. What form should a proof take?
4. What may be accepted without proof in geometry?

The book was translated from the Russian by Mark Samokhvalov and was first publised by Mir in 1978.