Prove that an equilateral triangle is equiangular.

In the figure, $\angle ACD$ is an exterior angle of $△ABC$. $\angle B=40°,\angle A=70°$. The measure of $\angle ACD$ is $k°$. Find the value of $k$.

The measures of angles of a triangle are $x°,\left(x-20\right)°,\left(x-40\right)°$. Find the measure of each angle.

The measure of one of the angles of a triangle is twice the measure of its smallest angle and the measure of the other is thrice the measure of the smallest angle. The measures of the three angles is $k°, 60°, 90°$. Find the value of $k$.

In figure, measures of some angles are given. Find the measure of $x$ (Write the answer without degree symbol).

In figure, line $AB \parallel$ line $DE$. Find the measure of $\angle ARE$ ( in degrees) using given measures of some angles.

In $△ABC$, bisectors of $\angle A$ and $\angle B$ intersect at point $O$. If $\angle C=70°$. The measure of $\angle AOB$ is $k°$. Find the value of $k$.

If$\Delta XYZ ~ \Delta LMN$write the corresponding angles of the two triangles and also write the ratios of corresponding sides.

In $\Delta PQR$, if $\angle R>\angle Q$ then