Question

calcule x no triângulo abaixo

Answer 1

45*+5x+4x= 180*
45*+9x= 180*
9x= 180*- 45*
9x= 135*
x= 135*/9
x= 15

45*+ 5×15+4×15=
45* +75*+ 60*= 180*.

Answer 2

$\textsf{Leia abaixo}$

Explicação passo-a-passo:

$\large\boxed{\begin{array}{l} \rm \: 5x + 4x + 45\textdegree = 180\textdegree \\ \\ \rm \: 9x = 180\textdegree - 45\textdegree \\ \\ \rm \: 9x = 135\textdegree \\ \\ \rm \: x = \dfrac{135\textdegree}{9} \\ \\ \boxed{ \rm{x = 15\textdegree}} \end{array}}$