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/B1 = /B2
/C3 = /C4
/A = 70°
/B = 60°
/B1 = /B2 = 30°
/C5 = 180° - 60° - 70°
/C5 = 50°
A . /C3 + /C4 = 180° - 50° = 130°
B. /B2 = 30°
C. /D = ?
/D = 180° - /B2 - (/C5 + /C3)
= 180° - 30° - (50° + 65°)
= 180° - 30° - 115°
= 35°
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