Question

Dau coroana PS e Patrulaterul ​

Answer 1

Răspuns:

a+b+c= 110×3

a+b+c=330

$a = \frac{b + c}{2} = >$

=> 2a=b+c

b=c+40°

=> 2a= c+ c+40°

2a=2c+40° | :2

a= c+ 20°

a+b+c =330°

c+20+c+40+c=330°

3c+60=330°

3c=270°

c=90

b=90+40

b=130

a=110