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Practice set 3.11. In figure 3.8, ZACD is an exterior angle of A ABC.4-40°, 2A= 70°. Find the measure of ACD.In A POR,<P = 70°、20-65° then find <R.

Answer»

Angle ACD=angle B + angle A(exterior angle property)

Angle ACD=40+70=110



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