Question

2b,3b,4b vă rog mult am nevoie urgent de ajutor dau coroană+stele+abonare​

Answer 1

Răspuns:

Explicație pas cu pas:

2b)

P=70 cm

AB+BC+CD+AD= 86

30+21+CD+14= 86

CD= 86-30-21-14

CD= 21cm

BC= 21 cm

       ↓

ΔBCD=isoscel

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∡A+∡B+∡D+∡C=360

∡C=360-270

∡C=90°

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3b)

∡A+∡B+∡D+∡C=360°

285+∡C=360

∡C= 360-285

∡C=75°

∡A+∡C=210

∡A+75=210

∡A=210-75

∡A=135°

135+2∡D+60+∡D+75= 360

2∡D+∡D=360-60-75-135

3∡D=360-270

∡D=90:3

∡D= 30°

∡B=2∡D+60

∡B=2*30+60

∡B=120°

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∡A=135°

∡B=120°

∡C=75°

∡D=30

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4b)

∡A=4∡C

∡B=AC/2

∡B=2∡C

∡B=∡D=2∡C

∡A+∡B+∡C+∡D=360°

4∡C+2∡C+∡C+2∡C=360°

9∡C=360

∡C=360:9

∡C=40°

∡A=40*4=160°

∡B=40*2=80°

∡D=80°

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∡A=160°

∡B=80°

∡C=40°

∡D=80°