Question : If three angles of a triangle are (2y + 40°), (5y – 60°), and (3y – 80°). Then what is the value of y?

Question : If $\sin (A-B)=\frac{1}{2}$ and $\sin (A+B)=1$, where A and B are positive acute angles and $ A \geq B$ then A and B are respectively:

Question : In a $\triangle ABC$, $\angle A +\angle B=70°$ and $\angle B+\angle C=130°$.Then, the value of $\angle A$ is:

Question : Which of the following is a value of $\theta$, when $\cos ^2 \theta-2+\cos \theta=0$?

Question : In $\triangle ABC$, $\angle B=60°$, $\angle C=40°$. AD is the bisector of $\angle A$ and AE is drawn perpendicular on BC from A. Then the measure of $\angle EAD$ is: