Question

determinați valoarea lui x din figura 3 si figura 4​

Answer 1

Figura 3:

<ABC=180⁰-(4x+25⁰)=155⁰-4x.

180⁰=155⁰-4x+2x+10⁰+3x-10⁰

180⁰=155⁰+x

x=25⁰.

Figura 4:

<ABC=180⁰-(3x+4⁰)=176⁰-3x.

<BAC=180⁰-(2x+8⁰)=172⁰-2x.

<ACB=180⁰-(2x-2⁰)=182⁰-2x.

180⁰=176⁰-3x+172⁰-2x+182⁰-2x

180⁰=530⁰-7x

7x=350⁰

x=50⁰.