How can I know how many lines of symmetry an object has? For eg a parallelogram or any other figure. how can I know if the object really has lines of symmetry or simple doesn't have any line of symmetry. Also how do we find rotational symmetry of some object?
Thanks
2006-09-27 08:46:43 · 4 answers · asked by Y L 2 in Science & Mathematics ➔ Mathematics
Well, a line of symmetry basically divides a shape into two symmetrical shapes. Thus, usually people determine a line of symmetry by their vision (e.g. a triangle, has lines of symmetry, as it can be divided into two identical pieces). You can also, to be exact, measure the angles between the sides and lengths of the sides.
A figure that can be turned about a point less than 360 degrees and land on an image of itself is said to have rotational symmetry. Just use your imagination and visualize its rotation.
2006-09-27 08:58:50 · answer #1 · answered by C. Menstein 4 · 0⤊ 0⤋
The only way I've ever been able to see lines of symmetry was to be able to see the shape. So draw a parallelogram and see if it has any lines of symmetry that you can draw.
Rotational symmetry means that if you rotate the object about a fixed point the object will look the same as if did before rotation.
Hope some of this makes sense and helps. Good Luck.
2006-09-27 16:01:42 · answer #2 · answered by SmileyGirl 4 · 0⤊ 0⤋
If a shape has a line of symmetry, you can "fold" the shape along the line of symmetry and the two halves will match up exactly. For example, consider a square. It has 4 lines of symmetry. Two along the diagonals, and two that bisect the sides.
As an example of rotational symmetry, consider a square again.
You can rotate the square by multiples of 90 degrees and get an image that is exactly the same again.
2006-09-27 16:06:02 · answer #3 · answered by z_o_r_r_o 6 · 0⤊ 0⤋
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2014-07-21 04:05:41 · answer #4 · answered by ? 2 · 0⤊ 0⤋