Question

Exercițiul 12 vă rog! Repede!!!!Am nevoie urgent​

Answer 1

Răspuns:

pt a

AOC=DOB=30°

AOD=COB=x°

AOC+COB+BOD+AOD=360°

30°+x°+30°+x=360°

60°+2x°=360

2x°=360°-60°

2x°=300°

x°=150°

AOD=COB=150°

pt b

AOC=DOB=x°

AOD=COB=90°+x°

AOC+COB+BOD+AOD=360°

x°+90°+x°+x°+90°+x°=360°

4x°+180°=360°

4x°=360°-180°

4x°=180°

x°=180°/4

x°=45°

AOC=DOB=45°

AOD=COB=90°+45°=135°

pt c

AOC=DOB=2x°

AOD=COB=6x°-60°

AOC+COB+BOD+AOD=360°

2x°+6x°-60°+2x°+6x°-60°=360°

16x°-120°=360°

16x°=360°+120°

16x°=480°

x°=480/16

x°=30°

AOC=DOB= 2*30°=60°

AOD=COB=6*30°-60=180°-60°=120°

pt d

COB=AOD=x°/4

DOB=AOC=2x°

AOC+COB+BOD+AOD=360°

x°/4+2x°+x°/4+2x=360°

x°/4+8x°/4+x°/4+8x°/4=1440°/4

x°+8x°+x°+8x=1440°

18x°=1440°

x°=80°

COB=AOD=80°/4=20°

DOB=AOC=2*80°=160°

Explicație pas cu pas:

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