Calculate the area of a circle with no pi radius and diameter but just the circumference

Calculate the area of a circle with no pi but just a diameter

Calculate the area of a circle with no pi but just a radius

Get the area of a Ellipse using radiuses

Get the area of a parallelogram by using the base by height

Get the area of a rectangle using one side

Get the area of a square using one side

Get the area of a trapezoid by using two bases and height