add lesson6

Karto/lesson6/cnt.py

@@ -0,0 +1,28 @@
+#!/usr/bin/env python3
+from math import cos, tan, asin, sqrt
+from deg import deg
+
+L12 = 396.942
+B12 = deg('40-19-21.0')
+D12 = L12 * cos(B12)
+
+L23 = 421.159
+H23 = 25.771
+B23 = asin(H23 / L23)
+D23 = sqrt(L23**2 - H23**2)
+
+L34 = 294.911
+B34 = deg('31-56-51.2')
+D34 = L34 * cos(B34)
+
+H41 = 77.226
+B41 = deg('38-45-7.8')
+D41 = H41 / tan(B41)
+
+print("""
+D12 = %4.3f""" % D12 + """
+D23 = %4.3f""" % D23 + """
+D34 = %4.3f""" % D34 + """
+D41 = %4.3f""" % D41 + """
+Sum = %4.3f""" % (D12 + D23 + D34 + D41) + """
+""")

Karto/lesson6/deg.py

@@ -0,0 +1,12 @@
+from math import pi
+
+def deg(inp):
+    """return angle in radians"""
+    if isinstance(inp, str) and '-' in inp:
+        deg, mm, ss = inp.split('-')
+        ddeg, dmm, dss = float(deg), float(mm), float(ss)
+        deg = ddeg + dmm/60 + dss/3600
+    else:
+        deg = float(instr)
+
+    return deg * pi / 180