Respuesta :

split the figure up into two rectangles
4*9=36
3*5=15
15+36=51sq cm
You can look at this like its 2 different rectangles with a small bottom rectangle and a big top rectangle

big rectangle area would be 9*4 = 36
small rectangle area would be 3*5 = 15
the entire area should be 36+15 = 51