Yes it does
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No A rectangle has rotational symmetry as well
Yes it does. As long as it has a symmetry without rotation. If you do the rotation either way it does have symmetry. :)
no, although they could as an isosceles triangle has two sides of equal length. So it could be an isosceles right angled triangle but it could also be an isosceles without a right angle, for example /\ this sort of shape.
Square, circle, equilateral triange! Hope I helped! :)
It can. An example of an isosceles triangle without any angles greater than 90 would be an equilateral triangle, with all angles equalling 60 degrees. An example with an angle greater than 90 would be a triangle with angles of 100 degrees, 40 degrees and 40 degrees. You couldn't have an isosceles triangle with 2 angles greater than or equal to 90, as all the angles sum to 180 degrees.