Find the measure of third angle of a triangle whose two angles are $40°$ and $80°$.

In a right-angle triangle, one acute angle is $30°$. Find the other acute angle.

A triangle can have two right angles.

A triangle can have two acute angles.

A triangle can have two obtuse angles.

Each angle of a triangle can be $60°$.

The angles of a triangle are in the ratio $1:2:3$. Find the angles.

In a figure, $DE\parallel BC$, $\angle A=30°$  and $\angle B=50°$. Find the values of $x, y \text{and} z$.

In the figure, $\angle ABD=3 \angle DAB$ and $\angle BDC=96°$. Find $\angle ABD$.