Question

I need help with 10. DONT ACCEPT IF U DONT KNOW HOW TO DO IT

Answer 1

1) As we can see there are two triangles, similar triangles. Similar triangles are proportional on their sides and congruent on their angles.

2) So, the angle a can be found by doing the triangle sum theorem

`\begin{gathered} m\angle a+90+30=180 \\ m\angle a+120=180 \\ m\angle a=60 \end{gathered}`