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(a) e=R-rn
(b) Calculation of rn:
rn=(((bi-t)*ti)+((bo-t)*to)+(t*h))/((bi*log((ri+ti)/ri))+(t*log((ro-to)/(ri+ti)))+(bo*log(ro/(ro-to))))
rn=82.4473 mm
(c)Calculation of R:
R=ri+ ((0.5* h^2 *t)+(0.5* ti^2 *(bi-t))+((bo-t)*to*(h- 0.5*to)))/(((bi-t)*ti)+((bo-t)*to)+(t*h))
R=88.1944 mm
(d)e=R-rn= 5.7472 mm
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