Question

vă rogg repede dau coroana ​

Answer 1

Răspuns:

Explicație pas cu pas:

∡AOB + ∡BOC=180°

∡AOB= 40+ BOC

          ↓

40+∡BOC + ∡BOC =180°

2 ∡BOC =180-40

2∡BOC=140 °

∡BOC=140:2

∡BOC=70°

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∡AOB= 40+ ∡BOC

∡AOB=40+70

∡AOB=110°

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b)

∡EOC= 70:2=35

∡COD≡AOB=110° (opuse la varf )

∡EOD= 35+AOB=35+110=145°

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13)

2x-25+105=180

2x=180+25-105

2x= 180-80

2x=100

x= 100:2

x=50

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