Lines and Math

Which of these is a regular polygon?

A regular triangle is also called 

In $△ABC,$ if $AB=AC$ and $\angle B=40°$, then $\angle A=k°$ then find the value of $k$.

In $△ABC,$ if $AB=AC$ and $\angle B=50°$, then $\angle A=k°$ then find the value of $k$.

What is the degree measure of each angle of an equilateral triangle? 

Write the name of the figure given below.

A/An _____ triangle has all the three sides equal.

All the angles of a/an _____ triangle are equal.

In Figure, the length (in $\mathrm{cm}$) of each side has been indicated along the side. State for given triangle whether it is scalene, isosceles or equilateral: