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diff --git a/3765/CH4/EX4.2/Ex4_2.sce b/3765/CH4/EX4.2/Ex4_2.sce
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+
+clc
+// Example 4.2.py
+// In Example 4.1, the deflection angle is increased to theta = 30 degrees. 
+// Calculate the pressure and Mach number behind the wave, and compare these
+// results with those of Example 4.1.
+
+
+// Variable declaration
+M1 = 3.0          // upstream mach number
+p1 = 1.0          // upstream pressure (in atm)
+T1 = 288          // upstream temperature (in K)
+theta = 30        // deflection (in degrees)
+
+// Calculations 
+// subscript 2 means behind the shock
+
+// from figure 4.5 from M1 = 3.0, theta = 30.0 deg.
+beta1 = 52.0                 // shock angle (in degrees)
+
+// degree to radian conversion is done by multiplying by %pi/180
+//
+Mn1 = M1 * sin(beta1*%pi/180) // upstream mach number normal to the shock
+
+// from Table A2 for Mn1 = 2.364
+p2_by_p1 = 6.276            // p2/p1
+Mn2 = 0.5286
+
+p2 = p2_by_p1 * p1          // p2 (in atm) = p2/p1 * p1
+M2 = Mn2/(sin((beta1-theta)*%pi/180)) // mach number behind the shock
+
+
+printf("\n Shock wave angle %.2f degrees",(beta1))
+
+printf("\n p2 = %.3f atm", p2)
+
+printf("\n M2 = %.2f ", M2)
+printf("\n comparison")