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What shape has no equal angles and only one pair of parallel sides?
That shape would be a trapezoid.
2 set of equal sides and 4 right angles?
either square if all the sides are equal in length but if only each 2 sides parallel are equal then it's a rectangle
Do all corresponding angles measure the same?
No. Corresponding angles are only equal when the lines crossed by the transversal are parallel.
In a rhombus are all angles equal?
no, all sides are equal but only all opposite angles are equal, except the special case of a square where all angles are equal to 90 degrees
Classification of triangle according to number of congruent sides?
3 sides equal = equilateral (if and only if three angle equal and each = 60 degrees); 2 sides equal = isosceles (if and only if the two angles that are opposite these sides are equal. And that implies they must be acute); 0 sides equal = scalene (if and only if all angles also different). "If and only if" is a mathematical device to say that each of the two statements implies the other, or that they are equivalent.
