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2→B(35°+20°=55°)
3→C(2x=180°-100° ; 2x=80° ; x=40°)
4→D(x=180°-(3x+20°) ; x=180°-3x-20°; x=160°-3x;4x=160°⇒x=40°)
III.a)∡B=∡AMP(2)
b)∡A=∡BMN(1)
c)∡C=∡APM(3)