

$$2p = B + b + S + h$$
Perimeter
$$A = \frac{\left(B + b \right) \times h}{2}$$
Area
$$B + b = \frac{2A}{h}$$
Sum of bases
$$h = \frac{2A}{B + b}$$
Height
$$p_{1} = B  b$$
Oblique side Projection
$$B  b = p_{1}$$
Difference of bases
$$B = b + p_{1}$$
$$b = B  p_{1}$$
Right Tr. delimited by height  oblique side
$$S = \sqrt{ {p_{1}}^2 + {h}^2 }$$
Side (Pythagoras' theorem)
$$p_{1} = \sqrt{ {S}^2  {h}^2 }$$
Oblique side Projection
$$h = \sqrt{ {S}^2  {p_{1}}^2 }$$
Height
Right Tr. delimited by height  longer diagonal
$$d_{1} = \sqrt{ {B}^2 + {h}^2 }$$
Longer Diagonal (Pythagoras' theorem)
$$B = \sqrt{ {d_{1}}^2  {h}^2 }$$
Longer Base
$$h = \sqrt{ {d_{1}}^2  {B}^2 }$$
Height
Right Tr. delimited by height  shorter diagonal
$$d_{2} = \sqrt{ {b}^2 + {h}^2 }$$
Shorter Diagonal (Pythagoras' theorem)
$$b = \sqrt{ {d_{2}}^2  {h}^2 }$$
Shorter Base
$$h = \sqrt{ {d_{2}}^2  {b}^2 }$$
Height
Definition
A right trapezoid is a trapezoid with a right angle (90 degree)
Properties
 It has a right angle (90 degree)
 All the Generic Trapezoid formulas are valid