We can split this figure up into two shapes - a rectangle and a triangle.
The rectangle has a width of 9 cm and a length of 12 cm. The triangle has a height of 15 - 9 = 6 cm and a base length of 12 - 3 - 3 = 6 cm.
Rectangle:
A = 12 x 9
A = 108 cm^2
Triangle:
A = 1/2 x 6 x 6
A = 1/2 x 36
A = 18 cm^2
Total figure:
108+ 18 = 126
The area of the figure is 126 cm^2.
Hope this helps!! :)