Please help, thanks!

Step-by-step explanation:

The sum of the interior angles of a polygon with sides is . Since the shape in the figure has 5 sides, the sum of its interior angles is .

Therefore, we can set up the following equation:

Since and make up one side of a line, they are supplementary, as each side of a line is .

Thus, we have:

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: