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How many lines of symmetry does an equilateral triangle have?
There can be only one pair of perpendicular lines in an isosceles triangle when it is a right angled isosceles triangle. A non right angled isosceles triangle has no pairs of perpendicular lines.
3
None. A triangle (not even an equilateral one) has no parallel sides.
In an equilateral triangle: 3 In an isosceles triangle: 1 In a scalene triangle: 0