Question

dau coroana va rog ajutor​

Answer 1

Răspuns:

ex 9.

a) x= 90°-(30°+25°)

x= 90°- 55°

x= 35°

b) x= (140°-70°):2

x= 35°

c) x+20°+ 2x+x= 180°

4x= 160°

x= 40°

ex. 10.

Daca ABD + DBC =180° => A,B,C= coliniare

72°23'+ 107°37'= 180°

180°= 180° =>A,B,C= coliniare

ex 11.

DBC= 121°11'