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diff --git a/2159/CH7/EX7.15/715.sce b/2159/CH7/EX7.15/715.sce
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+// problem 7.15
+Q=20.2
+i=1/2500
+C=60
+n=1/(tand(60))
+a=(3^0.5)
+d=((Q*(2^0.5))/(C*a*(i^0.5)))^0.4
+b=2*d/(a)
+disp(d,b,"dimension of the cross section in m")