How many rectangles are there in the following figure?

No. of Rectangles

1 Unit:- Total 12

2 Unit:- 

$\begin{array}{l}(1,2)(2,3)(1,4)(2,5)(3,6)(4,5)(5,6)\\ (4,7)(5,8)(6,9)(7,8)(8,9)(7,10)(8,11)\\ (9,12)(10,11)(11,12)\to 17\end{array}$

3 Unit:- $(1,2,3)(4,5,6)(7,8,9)(10,11,12)(1,4,7)$

$(4,7,10)(2,5,8)(5,8,11)(3,6,9)(6,9,12)$

4 Unit:- $(1,4,7,10)(2,5,8,11)(3,6,9,12)(1,2,4,5)$

$(2,3,5,6)(4,7,5,8)(5,6,8,9)(7,10,8,11)(8,9,11,12)\to 9$

6 Unit:- $(1,2,3,4,5,6)(4,5,6,7,8,9)(7,8,9,10,11,12)$

$(1,4,7,2,5,8)(2,3,5,6,8,9)(4,5,7,8,10,11)(5,6,8,9,11,12)\to 7$8 Unit:- $(1,2,4,5,7,8,10,11)(2,3,5,8,9,11,12)\text{\hspace{0.17em}}\to 2$

9 Unit:- $(1,2,3,4,5,6,7,8,9)(4,5,6,7,8,9,10,11,12)\to 2$

Whole Rectangle$\to 1$

Total$=12+17+10+9+7+2+2+1=60$

Method – 2

$\Rightarrow (1+2+3)\times (1+2+3+4)$

$\Rightarrow 60$