How many rectangles are there in the figure?

The total number of rectangle in the given figure will be calculated as follows:

count row and column:

Sum of sr. no. of rows:  1 + 2 + 3 + 4 = 10

Sum of sr. no. of  column: 1 + 2 + 3 + 4 = 10

Now multiply sum of sr. no.of rows and columns = 10×10= 100

No. of rectangles are = 100