Question

Mate clasa a VII a=Geometrie

Answer 1

Răspuns:

Explicație pas cu pas:

ABCD- romb

BD= bisectoare

∡BDC=x

∡BDC= ∡A/3

³⁾x= ∡A/3

3x=∡A

∡D= 2x

∡B=2x

∡C= 3x

∡A=3x

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3x+3x+2x+2x=360°

10x=360

x= 360:10

x= 36°

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∡D= 2*36=72°

∡B=72°

∡A= 3*36=108°

∡C= 108°

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b)

∡C=2x+6

∡A= 2x+6

∡D=x

∡B=x

2x+6+2x+6+x+x=360°

2x+2x+x+x= 360-6-6

6x= 348

x= 348:6

x= 58 °

∡A= 2x+6

∡A= 2*58+6

∡A=122°

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∡A=122°

∡D=58°