A kite
A rectangle has 2 pairs of parallel sides and its diagonals are of equal length but do not cross each other at 90 degrees
depending if its octagon regular, or irregular (sides arent equal angles arent equal
A parallelogram
A parallelogram (or rectangle) which is not a rhombus (or square).
A rectangle would fit the given description
When two perpendicular lines cross you get four equal angles of 90 degrees.
No. A cross product is just a way of simplifying a proportion. If the cross product aren't equal, it follows logically that the proportion isn't equal.
41 degrees Fahrenheit is equal to 5 degrees Celsius.
0 degrees C is equal to 32 degrees F
Negative 1.6 degrees Celsius is equal to about 29.12 degrees Fahrenheit.
60 degrees Celsius is equal to 140 degrees Fahrenheit.