Question

In right triangle ABC , m 12 years ago

Answer 1

solve for y and consider what kind of the triangle is.

Answer 2

keep in mind that the sum of all internal angles in a triangle add up to 180 degrees, thus

\(\large \begin{array}{cccllll}
A&B&C\\
\uparrow&\uparrow&\uparrow\\
90^o&+(y+10)^o&+(3y-10)^o=180^o
\end{array}\)

as @Loser66 said, solve for "y" to find the angles of B and C

Answer 3

y+10 + 3y-10 + 90 = 180
Solve for y