First mark each rectangles 1, 2 and 3 after we can cube of 1 +8+27=36 we get the answer

3+3+3=9 triangle 

Triangle ABD +Triangle ADC =2

Same as 2+2+2=6

And Triangle ABC=1 

So that total no of triangle in this figure is 9+6+1=16

In this figure counting the squares and we get the 27 squares.

The triangle 6 shown in figure and another is ADB,ACB, BDC,ADC, so that total number of triangle is 10

in the figure the 8 triangle is shown easily and another is COD , DOB, BOA, AOC, ACD, BDC,ABC, ABD so that total no. of triangle is 8+8=16