Rectangle...

Property 1. Each of the interior angles of a rectangle is 90∘

Since the opposite interior angles are equal, it immediately follows that all rectangles are parallelograms, whose properties apply to rectangles:

Property 2. The diagonals of a rectangle bisect each other.

Property 3. The opposite sides of a rectangle are parallel.

Property 4. The opposite sides of a rectangle are equal.

Property 5. A rectangle whose side lengths are a

a and b

b has area a b \sin{90^\circ} = ab.

absin90∘

=ab.

Property 6. A rectangle whose side lengths are a

a and b

has perimeter 2a + 2 b

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