The purpose Peter Chew Rule for solution of triangle is to provide a simple method compare current methods to aid in mathematics teaching and learning, especially if similar COVID-19 problems arise in the future. Therefore, applying Peter Chew Rule to some Engineering problems can help solve some engineering problems more easily and accurately. Besides being simple, Peter Chew's rule is also more accurate than current methods, because the main advantage of Peter Chew's rule is that there is no square root step. Usually the square root value is only an approximation. Therefore, using Peter Chew's rule will give a more accurate answer than using the cosine rule involving a square root step. The purpose of Peter Chew Rule for solution of triangle 1 is the same as Albert Einstein's famous quote Everything should be made as simple as possible, but not simpler. In addition, Albert Einstein's also quote : 1. We cannot solve our problems with the same thinking we used when we created them 2. If you can't explain it simply you don't understand it well enough, 3."Genius is making complex ideas simple, not making simple ideas complex.". 4. "Any intelligent fool can make things bigger and more complex. It takes a touch of genius - and a lot of courage - to move in the opposite direction." 5.God always takes the simplest way. 6.When the solution is simple, God is answering. Isaac Newton quote Nature is pleased with simplicity. And nature is no dummy. From the Albert Einstein's and Isaac Newton quote above, it can be seen that simplifying knowledge is very important.