Aswimming pool and deck are built in a rectangle with length 40 ft and width 18 ft. if the pool itself is 320 square feet, what is the area of the deck itself?

given that triangle abc is transformed two times to get triangle

a"b"c"

first abc is transformed in to a'b'c' as follows:

the coordinates of a are (1,-1) and transformed into a'(-1,1)

similarly b (4,-2) became b'(-4,2) and

c(7,-2) became c'(-7,2)

i.e. (x,y) becomes (-x,-y)

this is nothing but reflection about a point here origin.

thus first transformation is reflection on the origin.

next is exactly shifting 3 units down

source:

you need to rotate this triangle about the origin 270 degrees clockwise to create the full square.