If you use the real Pi , 3.140625 , from a real ratio 201 /64 , you would get 37.6875 inches . All ruler measurements like 1/2 , 1/4, 1/8 ,1/16 … is where the last decimal integer ends in 5 , just like the real Pi . If you use the present day Pi , your decimal integer circumference length keeps getting ever smaller , 10 , 100 , 1000 … in this case you would have a shrinking diameter . You are better off using the real Pi, that i have proven with Quora. Richard Eicholtz
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Answer:
Step-by-step explanation:
ALL YOU HAVE TO 19 - 1 THIRD AND THAT GIVES THE AWNSER TO PLUG INTO THE PROBLEM
Area of a circumference=π*r²for diameter=21.2 cm---------> r=10.6 cmA=π*10.6²--------> A=π*112.36 -------> A=352.81 cm²if 2π radians (full circumference) has an area of -----------------> 352.81 cm² 3π/5 radians-------------------------------------> XX=[(3π/5)*(352.81)]/2π---------> X=105.84 cm²
![4 \pi ^{2} r ^{3} = T^{2}GM \\ r^{3} = \frac{T ^{2} GM}{4 \pi^{2} } \\ r = \sqrt[3]{ \frac{T ^{2}GM }{4 \pi ^{2} } }](https://tex.z-dn.net/?f=4%20%5Cpi%20%5E%7B2%7D%20r%20%5E%7B3%7D%20%3D%20T%5E%7B2%7DGM%20%5C%5C%20r%5E%7B3%7D%20%20%3D%20%5Cfrac%7BT%20%5E%7B2%7D%20GM%7D%7B4%20%5Cpi%5E%7B2%7D%20%7D%20%20%5C%5C%20r%20%3D%20%20%5Csqrt%5B3%5D%7B%20%5Cfrac%7BT%20%5E%7B2%7DGM%20%7D%7B4%20%5Cpi%20%20%5E%7B2%7D%20%7D%20%7D%20%20)