-- isosceles triangle
-- trapezoid
-- 2-dimensional front-external-view of the human body
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An isosceles triangle and a kite have only one line of symmetry.
A one-dimensional shape is a line. A straight line does not have to have a width, only a length. A curved line has both a linear dimension and an angular width (subtended arc).*A point is said to have zero of three classical dimensions, while it does have a dimension of time.
Using a line of symmetry. For example, some shapes, such as a heart, will have one, while circles have an infinite number. The letter M has only one, right through the the V-shape in the middle.
triangle
Only One Line of SymmetryAn isosceles triangle only has one line of symmetry.