UnScramble this Word: a l e s s h t?

Questions

A line drawn from an angle of a triangle to the mid-point of the opposite side is a(n) ?

A triangle with three equal sides is called ?

A triangle with two equal sides is called ?

An angle greater than 180 degrees and less than 360 degrees is a(n) ?

An angle greater than 90 degrees and less than 180 degrees is said to be ?