A rhombus has unequal diagonals which intersect at right-angles.
A kite
depending if its octagon regular, or irregular (sides arent equal angles arent equal
A parallelogram
The shape you are describing is a rhombus. A rhombus has two pairs of parallel sides, with opposite sides being equal in length. The diagonals of a rhombus are also equal in length, but they do not intersect at 90 degrees; instead, they intersect at a 90-degree angle.
The shape you're describing is a kite. A kite has two pairs of adjacent sides that are equal in length, and its diagonals intersect at right angles (90 degrees). However, the lengths of the diagonals are not equal, which distinguishes it from a rhombus.
When two perpendicular lines cross you get four equal angles of 90 degrees.
A parallelogram (or rectangle) which is not a rhombus (or square).
A rectangle would fit the given description
41 degrees Fahrenheit is equal to a temperature of 5 degrees Celsius.
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.
0 degrees C is equal to 32 degrees F
Negative 1.6 degrees Celsius is equal to 29.12 degrees Fahrenheit.