What is a destroyed angle called?

Find the area of a parallelogram with base 15 yards and height 21 2/3

How do you create a data set with 8 points in it that has a mean of approximately 10 and a standard deviation of approximately 1?

The area of a rectangle is 10 cm^2. one side of the rectangle is x cm. express the perimeter of the rectangle in terms of x and show that this rectangle cannot have a perimeter of 12 cm. the perimeter of the rectangle in terms of x is __ cm