Question

(7x + 2)°
(2x - 11)
31°
1499
valoarea lui r.
dau coroana

Answer 1

Răspuns:

x=21

Explicație pas cu pas:

31+149=180

(7x+2)+(2x-11)=180

9x-9=180

9x=189

x=21

Answer 2

Răspuns: $\red{\bf x=21^{\circ}}$

Explicație pas cu pas:

✳ Suma masurilor unghiurilor unui patrulater complex este de 360°

$\bf 31^{\circ} + 149^{\circ} + (7x+2)^{\circ} +(2x-11)^{\circ}=360^{\circ}$

$\bf 180^{\circ} + 7x^{\circ}+2^{\circ} +2x^{\circ}-11^{\circ}=360^{\circ}$

$\bf 171^{\circ} + 9x^{\circ}=360^{\circ}$

$\bf 9x^{\circ}=360^{\circ}-171^{\circ}$

$\bf 9x^{\circ}=189^{\circ} ~~~\bigg|:9$

$\red{\boxed{\bf x=21^{\circ}}}$

#copaceibrainly