What is the reasoning for this proof?

Mathematical reasoning and proof offer powerful ways of developing and expressing insights about a wide range of phenomena. ... Ultimately, a mathematical proof is a formal way of expressing particular kinds of reasoning and justification. Being able to reason is essential to understanding mathematics.

10% of increase is the final answer! : )

step-by-step explanation:

consider an orange peel: if you want to try and lay it flat, you have to stretch it, we know exactly how things are being stretched or squashed at any given point. we have many different map projections because each has different patterns of some projections can even preserve certain features of the earth without