Q regarding how 2° / 360 = 100’ / 2π(R) is simplified to R = 9000 / π = 2866.24’

esfogel

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Q regarding how 2° / 360 = 100’ / 2π(R) is simplified to R = 9000 / π = 2866.24’

Hello, the below equation, and simplification of the equation, is offered in my study text. What I would love to know, is what rule allows me to isolate the variable "R" on one side of the equation. Maybe if someone recognized what type of equation this is, I could look it up and read about it, to get the understanding that I'd like. It is an engineering study, which assumes I would already have the mathematical knowledge.
2° / 360 = 100’ / 2π(R) is simplified to: R = 9000 / π = 2866.24’
 
Hello, the below equation, and simplification of the equation, is offered in my study text. What I would love to know, is what rule allows me to isolate the variable "R" on one side of the equation. Maybe if someone recognized what type of equation this is, I could look it up and read about it, to get the understanding that I'd like. It is an engineering study, which assumes I would already have the mathematical knowledge.
2° / 360 = 100’ / 2π(R) is simplified to: R = 9000 / π = 2866.24’

If \(\displaystyle \frac {a}{b} =\frac{c}{d}\) then \(\displaystyle ad=bc\)
 
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