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A right angle is always formed by two perpendicular lines. These lines would split a circle into quarters. There are 360 degrees in a circle, so one quarter would be 90 degrees. A right angle is always 90 degrees.
An equilateral triangle and an isosceles triangle would both have lines of symmetry that would split it into two triangles.
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A line of symmetry is a line through a shape. It shows that on either side of this line that the picture is exactly the same. There can be more than one line of symmetry in a shape.They are 'mirror images' when a shapes are divided by a lines of symmetry.
The heart does have both symmetries. it can be split through the middle and rotated 4 times to make rotational symmetry