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A rectangle has two lines of symmetry, the lines that connect the midpoints of the parallel sides of a rectangle are lines of symmetry of the rectangle.
An isosceles triangle has exactly one line of symmetry, a rectangle has two. A trapezoid can have none or one.
Actually, a rectangle has four lines of symmetry:One horizontal;One vertical; andTwo diagonal.
An isosceles triangle has only one line of symmetry
There are 11 letters with only one line of symmetry.