square of 961 = 31
square of 169 = 13
whoms answer is also the reverse of the tops answer {180 rotation}
Out of these, 196 is the only three digits number which becomes a perfect square of 14
??? the square root of 169 = 13... how is that
not a perfect square?
to further your comments that followed, i did a
horizontal mirror = 180 degree rotation. { orientation changes } last is first, first is last.
and when rotate 180°
ie 1 type of rotation...
if you do a vertical mirror {a different type of 180 degree rotation} the number can swap from 6-9 etc
169 = 196
which both have perfect squares.
13 and 14 respectfully.
now if u do a vertical mirror and horizontal mirror you can swap the number and change order.
169 = 196
| |
691 = 961
which is
2 sets of 180 degree rotation . and only the 196 = 961 has perfect squares.
Some do, some teach, the rest look it up.