Question

ex 16 dau coroana și 5 stele repedeee​

Answer 1

Răspuns:

Explicație pas cu pas:

a)

3*arc AB= 4 *arc BC

arc AB= (4* arc BC)/ 3

-

arc AD= 2* arc BC

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6* arc CD = 5 *arc AD

6*arc CD = 5*( 2 arc BC)

6*arc CD= 10* arc BC

arc CD= (10 arc BC) /6

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²⁾(4*arc BC)/3 + ⁶⁾2*arc BC+ (10*arc BC) /6 + ⁶⁾arc BC= ⁶⁾360°

8*arc BC+ 12*arc BC+ 10 *arc BC+6*arc BC= 2160°

36* arc BC= 2160°

arc BC= 2160:30

arc BC= 60°

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3*arc AB= 4*arc BC

3*arc AB= 4*60

3*arc AB= 240°

arc AB= 240:3

arc AB= 80

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arc AD= 2*arc BC

arc AD= 2*60

arc AD= 120°

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6*arc CD =5*arc AD

6*arcCD= 5*120

6*arc CD= 600

arc CD= 600:6

arc CD= 100°

-

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b)

∡A= 160:2=80°

∡B=(120+100):2= 110°

∡C= (80+120):2=100°

∡D= (80+60):2= 70°