of a certain perimeter is that rhombus that has each pair of adjacent sides perpendicular, in which
case you have a square.
Square: A square is a four-sided figure with four right angles and four equal sides. A square is also a
rectangle, a parallelogram, and a rhombus. The perimeter of a square is equal to 4 times the length
of one side.
Area of Square = (side)^2
The square above, with sides of length 5, has an area of 5^2 = 25.
FIVE SPECIAL QUADRILATERAL TYPES
1. Trapezoid: One pair of parallel sides.
Parallelogram: Two pairs of parallel sides.
Area of Parallelogram = base × height
2.
Rectangle: Four right angles.
Perimeter of Rectangle = 2(length + width)
Area of Rectangle = length × width
3.
4. Rhombus: Four equal sides.