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First thing first your gonna have to find the area of the triangle within the rectangle.

Area of triangle = 1/2 b x h
= (1/2 9) x 4
= 4.5 x 4
= 18 cm square

Then after finding the area of the triangle your gonna find the area of the rectangle.

Area of rectangle = length x width
12 x 4 = 48
= 48 cm square

Then your gonna subtract the area of the triangle from the area of the rectangle.

Area of rectangle = 48 cm square
Area of triangle = 18 cm square
= 30 cm square

So the shaded region is 30 cm square

8doors on the second floor

P(chicago, illinois)