Two angles

The triangles ABC and A'B'C 'are similar. In the ABC triangle, the two angles are 25° and 65°. Explain why in the triangle A'B'C 'is the sum of two angles of 90 degrees.

Correct result:

x =  90 °

Solution:

$$\begin{gathered} A=25^{\circ } \\ B=65^{\circ } \\ C=180-(A+B)=180-(25+65)=90^{\circ } \\ x=A+B=25+65=90^{\circ } \end{gathered}$$

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