A figure bounded by three-line segments is called a .

A triangle has _____ angles.

There are _____ sides of a triangle.

The sum of three angles of a triangle is equal to _____$°$ .

Degree is the measurement of any  _____ .

Name the points in the interior and exterior of the $△\mathrm{ABC}$.

What is the altitude of a triangle? How many altitudes are there in a triangle? Explain the above with a diagram.

How many medians are there in a triangle? 

The angles of a triangle are in the ratio of $2:3:4$. If the measures of the largest angle is $k°$, find the value of $k$