A kite.
Well, honey, that shape you're looking for is a pentagon. It's got 5 sides and just one line of symmetry to keep things nice and balanced. So, there you have it - a pentagon is the answer you've been searching for.
An isosceles trapezoid has 1 vertical line of symmetry
scalene triangle.
well it has 1 line but it depends on the shape of the rhombus
A kite.
Yes. Think of a kite shape. Symmetry along its length but no parallel sides.
It is a regular pentagon!
An isosceles triangle has exactly one line of symmetry.
A kite.
As isosceles triangle.
An isosceles triangle has one line of symmetry
An isosceles triangle - a triangle with two sides of equal length.
It has 1 line of symmetry
An isosceles triangle has one line of symmetry
An isosceles triangle has one line of symmetry
Sounds like an isosceles triangle, with the line of symmetry from the third angle to the mid-point of the third side.