Straight angle always has 180 degrees this is correct?

What is the size of the matrix resulting from

Aswimming pool is a rectangle with semicircles on the end. the rectangle is 12 meters wide and 30 meters long. the diameter and width of the swimming pool are equal. sketch and label an overhead diagram of the swimming pool. find the area of the swimming pool floor.

Rewrite the following quadratic functions in intercept or factored form. show your work. y = 9 + 12x + 4x^2